feat: Add support for enterprise audit log streaming API

[amreshh]

This PR implements the enterprise audit logs api (https://docs.github.com/en/enterprise-cloud@latest/rest/enterprise-admin/audit-log?apiVersion=2022-11-28)

This includes:

• enterprise_audit_log_stream.go: Implements crud operations for the audit log streaming endpoint
• enterprise_audit_log_stream_test.go: Unit tests for audit_log_stream.go

Besides the api implementation, I also added examples/auditlogstream/main.go run a simple real world test for creating a audit log stream towards Azure Blob Storage.

Closes #3663

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[codecov]

Codecov Report

❌ Patch coverage is 36.55914% with 118 lines in your changes missing coverage. Please review.
✅ Project coverage is 93.53%. Comparing base (a70ac77) to head (72a5150).

Files with missing lines	Patch %	Lines
example/auditlogstream/main.go	0.00%	90 Missing ⚠️
github/enterprise_audit_log_stream.go	70.83%	28 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4035      +/-   ##
==========================================
- Coverage   94.08%   93.53%   -0.56%     
==========================================
  Files         207      209       +2     
  Lines       19217    19403     +186     
==========================================
+ Hits        18081    18149      +68     
- Misses        938     1056     +118     
  Partials      198      198              

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[alexandear]

Is it possible to tidy up the PR's description? See https://github.com/google/go-github/blob/master/CONTRIBUTING.md#tips for tips.

The verification plan is not complete. You need to run ./script/lint.sh and ./script/test.sh according to https://github.com/google/go-github/blob/master/CONTRIBUTING.md#submitting-a-patch

[gmlewis]

Thank you, @amreshh!
One minor nit and a question, otherwise LGTM.
Awaiting second LGTM+Approval from any other contributor to this repo before merging.

cc: @alexandear

[gmlewis]

This interface immediately looked odd to me because you are not exporting the one interface method, however below it looks like this was absolutely intensional, and therefore should be noted in the comment.
But then I'm left wondering - would it be beneficial for a user of this client library to provide their own method? I don't know.

In the meantime, how about this?

Suggested change

	// AuditLogStreamVendorConfig is a marker interface for vendor-specific audit log
	// stream configurations.
	// AuditLogStreamVendorConfig is a sealed marker interface for vendor-specific audit log
	// stream configurations. Only this package can define implementations.

[amreshh]

@gmlewis: Yes that one interface is sealed on purpose, I thought to do it this way to catch any invalid vendor configs early on, and mimic the api strictly to what they support.
I could also export it but still you are dependent on what the GitHub api provides, so any other input would still result in an error from the api which needs to be handled.

[gmlewis]

OK, perfect... then I think we should document this fact somehow. If you want to come up with your own wording, that is fine by me.

[gmlewis]

Suggested change

	// Implement the marker interface for all vendor config types.
	// Implement the sealed marker interface for all vendor config types.

[gmlewis]

Also, @amreshh - if you could add unit tests to cover all the new New* methods, that would be great: