[TestProxy] Common Sanitizers

[scbedd]

This PR moves the test-proxy from a static append-only set of sanitizers, to an actual data structure with proper addition/removal of applied sanitizers.

• Each recording or playback session now gets a modifiable list of sanitizers that are applied.
  • Session sanitizers are now cut at playback or record start. Any further session sanitizer addition will not directly affect the recording that has been started.
• As a consequence of all these additional sanitizers, stored recordings will now be sanitized. The way this will work is
  • Client starts playback session, gets a recordingId back
  • Client uses recordingId to add a couple additional sanitizers
  • Client starts firing actual requests from the test
  • The proxy will sanitize the loaded recording according to which sanitizers are active when the first real request for the playback session occurs.
• Upon calling /Admin/AddSanitizers or Admin/AddSanitizer, an object or list of objects representing the registered sanitizers is now returned to the calling client. These objects contain the base sanitizer properties + the id of the registered sanitizer.
• Added route /Admin/RemoveSanitizers which can apply to either the session-level or an individual playback/record session.

Observers please add suggestions either in discussion or directly onto the branch.

[chlowell]

Does the proxy already have a way to deduplicate sanitizers so we don't run all of these twice? If not, I imagine it could compare two sanitizers with hashes of their string parameters

[scbedd]

Does the proxy already have a way to deduplicate sanitizers so we don't run all of these twice? If not, I imagine it could compare two sanitizers with hashes of their string parameters

It does not at this time. We will pay the cost for now. I have another PR in the works that makes sanitizers set/get/remove from a single abstraction class. Doing this hash check there would make the most sense if we do it 👍

[scbedd]

Thank you to all the reviewers on this PR: @pvaneck , @JoshLove-msft , @chlowell, @samvaity, and @benbp . Hugely appreciate all your feedback.

go, python, .net, and cpp have shifted onto a proxy version produced by this PR. Only java and js remain to migrate, and they are almost there. Given all that. I'm going to merge this PR, as I have further PRs to assist debugging that should include these changes.

[scbedd]

/check-enforcer evaluate