Rate limit ADR update (#951)

* Remove context from ADR

* Add paths support to ADR

* Draft for adding headers support

* Rename fields and refine existing wording

* Remove metric decision and remove it from the scope of the ADR.

* Simplify headers configuration

* Fix rate limiting header

* Update ADR after feedback

* Add docs about limitation of RateLimitCR to one per workload

* Remove docs about unsupported multiple RateLimit CR

* Update status of Rate Limit ADR to Accepted

* Apply suggestions from code review

Co-authored-by: Natalia Sitko <[email protected]>

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Co-authored-by: Natalia Sitko <[email protected]>