STORAGE: Moving get_bucket, create_bucket and delete_bucket off of Connection.

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The minimum version of google-cloud-bigquery was updated to 3.3.5 in pandas-gbq
version 0.18.0 (released November 2022). This change updates the runtime check
in features.py to reflect that minimum version and removes some dead code for
feature checks that are no longer relevant.

…le inconsistencies (#721)

Release-As: 0.39.1

…mplates/python_library/.kokoro (#721)

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Amazon has this variable documented, and apparently people are trying to 
use it, so we should support it

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…nown failures to specific failures. (#721)

* docs: lint fix for samples

* feat: enable foreign key support

* feat: add support for spanner fk

* feat: disable foreign key as without on delete cascade the db cleanup process fails

* fix: add comment as to why foreign key creation is disabled in django

* fix: move test_check_constraints_sql_keywords to django3.2 skipped tests

* chor: cleanup tests

* tests: add failing tests in skipped test

* feat: enable SQLAlchemy 2.0's insertmany feature

- Enable the use_insertmanyvalues flag on the dialect to support
  SQLAlchemy 2.0's insertmany feature, which allows multiple ORM
  objects to be inserted together in bulk, even if the table has
  server-side generated values which must be included in a THEN RETURN
  clause
- Provide an example for using the feature with client-side supplied
  UUIDs and insert_sentinel columns.
- Ensure that the feature is not enables for bit-reversed primary
  keys. In other dialects, an incrementing primary key can be used
  rather than a sentinel column. In Spanner, the bit-reversed integers
  do not meet the ordering requirement to be used as implicit
  sentinels

https://docs.sqlalchemy.org/en/20/core/internals.html#sqlalchemy.engine.default.DefaultDialect.use_insertmanyvalues

https://docs.sqlalchemy.org/en/20/core/connections.html#insert-many-values-behavior-for-insert-statements

https://docs.sqlalchemy.org/en/20/core/connections.html#configuring-sentinel-columns

Fixes: #720

* chore: update tests for multiplexed sessions

* chore: make sample runnable

* fix: exclude commit_timestamp col from THEN RETURN

---------

Co-authored-by: Knut Olav Løite <koloite@gmail.com>

* tests (fileio): add tarfile based test case for reader seek

Background info: googleapis/python-storage#462

* fix: Patch blob reader to return correct seek/tell values (#462)

Co-authored-by: Andrew Gorcester <gorcester@google.com>

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