* feat: Adds Pluggable Auth support to ADC  (googleapis#895)

* chore(deps): update dependency com.google.http-client:google-http-client-bom to v1.41.5 (googleapis#896)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [com.google.http-client:google-http-client-bom](https://togithub.com/googleapis/google-http-java-client) | `1.41.4` -> `1.41.5` | [![age](https://badges.renovateapi.com/packages/maven/com.google.http-client:google-http-client-bom/1.41.5/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/maven/com.google.http-client:google-http-client-bom/1.41.5/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/maven/com.google.http-client:google-http-client-bom/1.41.5/compatibility-slim/1.41.4)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/maven/com.google.http-client:google-http-client-bom/1.41.5/confidence-slim/1.41.4)](https://docs.renovatebot.com/merge-confidence/) |

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### Release Notes

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<summary>googleapis/google-http-java-client</summary>

### [`v1.41.5`](https://togithub.com/googleapis/google-http-java-client/blob/HEAD/CHANGELOG.md#&#8203;1415-httpsgithubcomgoogleapisgoogle-http-java-clientcomparev1414v1415-2022-03-21)

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* feat: Add ability to provide PrivateKey as Pkcs8 encoded string googleapis#883 (googleapis#889)

* feat: Add ability to provide PrivateKey as Pkcs8 encoded string googleapis#883

This change adds a new method `setPrivateKeyString` in `ServiceAccountCredentials.Builder` to accept Pkcs8 encoded string representation of private keys.

Co-authored-by: Timur Sadykov <stim@google.com>

* chore: fix downstream check (googleapis#898)

* fix: update branding in ExternalAccountCredentials (googleapis#893)

These changes align the Javadoc comments with the branding that Google uses externally:

+ STS -> Security Token Service
+ GCP -> Google Cloud
+ Remove references to a Google-internal token type

Thank you for opening a Pull Request! Before submitting your PR, there are a few things you can do to make sure it goes smoothly:
- [ ] Make sure to open an issue as a [bug/issue](https://github.com/googleapis/google-auth-library-java/issues/new/choose) before writing your code!  That way we can discuss the change, evaluate designs, and agree on the general idea
- [ ] Ensure the tests and linter pass: Tests are failing, but I don't think that was caused by the changes in this PR
- [ ] Code coverage does not decrease (if any source code was changed): n/a
- [ ] Appropriate docs were updated (if necessary): n/a

* feat: Adds the ExecutableHandler interface for Pluggable Auth

* feat: Adds a Pluggable Auth specific exception

* feat: Adds new PluggableAuthCredentials class that plug into ADC

* feat: Adds unit tests for PluggableAuthCredentials and ExternalAccountCredentials

* Add units tests for GoogleCredentials

* fix: update javadoc/comments

* fix: A concrete ExecutableOptions implementation is not needed

* review: javadoc changes + constants

Co-authored-by: WhiteSource Renovate <bot@renovateapp.com>
Co-authored-by: Navina Ramesh <navi.trinity@gmail.com>
Co-authored-by: Timur Sadykov <stim@google.com>
Co-authored-by: Neenu Shaji <Neenu1995@users.noreply.github.com>
Co-authored-by: Jeff Williams <jeffrey.l.williams@gmail.com>

* feat: finalizes PluggableAuth implementation (googleapis#906)

* Adds ExecutableResponse class

* Adds unit tests for ExecutableResponse

* Adds 3rd party executable handler

* Adds unit tests for PluggableAuthHandler

* Fix build issues

* don't fail on javadoc errors

* feat: Improve Pluggable Auth error handling (googleapis#912)

* feat: improves pluggable auth error handling

* cleanup

* fix: consume input stream immediately for Pluggable Auth (googleapis#915)

* feat: improves pluggable auth error handling

* cleanup

* fix: consume input stream immediately so that the spawned process will not hang if the STDOUT buffer is filled.

* fix: fix merge

* fix: review comments

* fix: refactor to keep ImpersonatedCredentials final (googleapis#917)

* fix: adds more documentation for InternalProcessBuilder and moves it to the bottom of the file

* fix: keep ImpersonatedCredentials final

* fix: make sure executor is shutdown

Co-authored-by: WhiteSource Renovate <bot@renovateapp.com>
Co-authored-by: Navina Ramesh <navi.trinity@gmail.com>
Co-authored-by: Timur Sadykov <stim@google.com>
Co-authored-by: Neenu Shaji <Neenu1995@users.noreply.github.com>
Co-authored-by: Jeff Williams <jeffrey.l.williams@gmail.com>
Co-authored-by: Emily Ball <emilyball@google.com>