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]

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

[amreshh]

@gmlewis : Good catch about the test cases, added those as well.