Move the 'thread-local stack' implementation up from datastore.

Co-authored-by: release-please[bot] <55107282+release-please[bot]@users.noreply.github.com>

* chore(deps): update all dependencies

* 🦉 Updates from OwlBot post-processor

See https://github.com/googleapis/repo-automation-bots/blob/main/packages/owl-bot/README.md

* Don't bump protobuf yet, it's not compatible

Co-authored-by: Owl Bot <gcf-owl-bot[bot]@users.noreply.github.com>
Co-authored-by: Mariatta Wijaya <Mariatta@users.noreply.github.com>

Google Cloud defines a small set of common resources that do not
belong to specific APIs or message types. All generated service
clients now contain helper methods that allow construction and parsing of these paths.

See
https://github.com/googleapis/googleapis/blob/master/google/cloud/common_resources.proto
for the list of common resources for Google Cloud.

- [ ] Regenerate this pull request now.

PiperOrigin-RevId: 472772457

Source-Link: googleapis/googleapis@855b74d

Source-Link: googleapis/googleapis-gen@b64b1e7
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- [ ] Regenerate this pull request now.

PiperOrigin-RevId: 472772457

Source-Link: googleapis/googleapis@855b74d

Source-Link: googleapis/googleapis-gen@b64b1e7
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* fix: mypy errors

* fixing linter errors

* addressing review comments

* fixing test coverage

* fixing test comments

* fixing test comments

* linting for test

* fixing test comment

* fix: unsetting clustering fields from Table

* Remove unused stuff from table.py

* Use _PROPERTY_TO_API_FIELD in Table properties

* Clarify why a property is set to explicit None

🤖 I have created a release \*beep\* \*boop\*
---
## [2.14.0](https://www.github.com/googleapis/python-bigquery/compare/v2.13.1...v2.14.0) (2021-04-26)


### Features

* accept DatasetListItem where DatasetReference is accepted ([#597](https://www.github.com/googleapis/python-bigquery/issues/597)) ([c8b5581](https://www.github.com/googleapis/python-bigquery/commit/c8b5581ea3c94005d69755c4a3b5a0d8900f3fe2))
* accept job object as argument to `get_job` and `cancel_job` ([#617](https://www.github.com/googleapis/python-bigquery/issues/617)) ([f75dcdf](https://www.github.com/googleapis/python-bigquery/commit/f75dcdf3943b87daba60011c9a3b42e34ff81910))
* add `Client.delete_job_metadata` method to remove job metadata ([#610](https://www.github.com/googleapis/python-bigquery/issues/610)) ([0abb566](https://www.github.com/googleapis/python-bigquery/commit/0abb56669c097c59fbffce007c702e7a55f2d9c1))
* add `max_queue_size` argument to `RowIterator.to_dataframe_iterable` ([#575](https://www.github.com/googleapis/python-bigquery/issues/575)) ([f95f415](https://www.github.com/googleapis/python-bigquery/commit/f95f415d3441b3928f6cc705cb8a75603d790fd6))
* add type hints for public methods ([#613](https://www.github.com/googleapis/python-bigquery/issues/613)) ([f8d4aaa](https://www.github.com/googleapis/python-bigquery/commit/f8d4aaa335a0eef915e73596fc9b43b11d11be9f))
* DB API cursors are now iterable ([#618](https://www.github.com/googleapis/python-bigquery/issues/618)) ([e0b373d](https://www.github.com/googleapis/python-bigquery/commit/e0b373d0e721a70656ed8faceb7f5c70f642d144))
* retry google.auth TransportError by default ([#624](https://www.github.com/googleapis/python-bigquery/issues/624)) ([34ecc3f](https://www.github.com/googleapis/python-bigquery/commit/34ecc3f1ca0ff073330c0c605673d89b43af7ed9))
* use pyarrow stream compression, if available ([#593](https://www.github.com/googleapis/python-bigquery/issues/593)) ([dde9dc5](https://www.github.com/googleapis/python-bigquery/commit/dde9dc5114c2311fb76fafc5b222fff561e8abf1))


### Bug Fixes

* consistent percents handling in DB API query ([#619](https://www.github.com/googleapis/python-bigquery/issues/619)) ([6502a60](https://www.github.com/googleapis/python-bigquery/commit/6502a602337ae562652a20b20270949f2c9d5073))
* missing license headers in new test files ([#604](https://www.github.com/googleapis/python-bigquery/issues/604)) ([df48cc5](https://www.github.com/googleapis/python-bigquery/commit/df48cc5a0be99ad39d5835652d1b7422209afc5d))
* unsetting clustering fileds on Table is now possible ([#622](https://www.github.com/googleapis/python-bigquery/issues/622)) ([33a871f](https://www.github.com/googleapis/python-bigquery/commit/33a871f06329f9bf5a6a92fab9ead65bf2bee75d))


### Documentation

* add sample to run DML query ([#591](https://www.github.com/googleapis/python-bigquery/issues/591)) ([ff2ec3a](https://www.github.com/googleapis/python-bigquery/commit/ff2ec3abe418a443cd07751c08e654f94e8b3155))
* update the description of the return value of `_QueryResults.rows()` ([#594](https://www.github.com/googleapis/python-bigquery/issues/594)) ([8f4c0b8](https://www.github.com/googleapis/python-bigquery/commit/8f4c0b84dac3840532d7865247b8ad94b625b897))
---


This PR was generated with [Release Please](https://github.com/googleapis/release-please). See [documentation](https://github.com/googleapis/release-please#release-please).

* fix: lint_setup_py was failing in Kokoro is not fixed

* perf: removed nox run on all kokoro workers and moved it to github actions

* feat: add decimal/numeric support

* fix: Update links in comments to use googleapis repo (#622)

* refactor: common settings for unit tests and system tests

Co-authored-by: Chris Kleinknecht <libc@google.com>

* feat: add turbo replication support

* lintfix

* nother-lint-fix

* hmm weird

* i need to learn how to use lint better...

* .

* .

* how about now?

* take rpo out of constructor

* add unit tests

* add link to docs

* ensure inclusion of "rpo" in bucket._changes

* add rpo samples

* lint it

* address cathys nits

* fix a little test thing

* start to fix weirdness, creating issue to address more fully

* change it back