feat(2700): Add audit log of operations on the Options page

[GWT5091]

Context

There is no way to verify who performed the operations on the Options page.

Objective

Audit logs are outputted in such cases.

• Users Create/Delete pipeline
• Users Update checkout URL/Source Directory
• Users Create/Update/Delete Secrets
• Users Create/Refresh/Delete Pipeline token

Example output:
{"level":"info","message":"[Audit] user foo:github:github.com creates the pipeline for github.com:12345:main.","timestamp":"2022-09-09T02:40:41.609Z"}

References

[Feature Request] Audit log of operations on the Options page #2700

License

I confirm that this contribution is made under a BSD license and that I have the authority necessary to make this contribution on behalf of its copyright owner.

[coveralls]

Coverage increased (+0.02%) to 95.817% when pulling 0cbb52a on sonic-screwdriver-cd:add_audit_log into 78e7d73 on screwdriver-cd:master.