[APPSEC-57738] Add API Security sampler

[Strech]

What does this PR do?

Add API security sampling logic required for API Security RFC

Motivation:

API Security RFC

Change log entry

Yes. AppSec: Add API Security to the rack, rails, sinatra and grape contribs.

Additional Notes:

I have adjusted LRU cache to give it store method.

How to test the change?

We have ST + CI to cover 99.9%

[datadog-datadog-prod-us1]

Datadog Report

Branch report: appsec-57738-add-api-security-sampler
Commit report: 648b7eb
Test service: dd-trace-rb

✅ 0 Failed, 21767 Passed, 1304 Skipped, 4m 53.07s Total Time

[pr-commenter]

Benchmarks

Benchmark execution time: 2025-06-23 10:55:56

Comparing candidate commit 648b7eb in PR branch appsec-57738-add-api-security-sampler with baseline commit 748314c in branch master.

Found 0 performance improvements and 0 performance regressions! Performance is the same for 45 metrics, 2 unstable metrics.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 78.71486% with 106 lines in your changes missing coverage. Please review.

Project coverage is 97.52%. Comparing base (748314c) to head (648b7eb).

Files with missing lines	Patch %	Lines
...integration/api_security/schema_extraction_spec.rb	29.05%	105 Missing ⚠️
...contrib/devise/signin_single_user_tracking_spec.rb	90.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4699      +/-   ##
==========================================
- Coverage   97.63%   97.52%   -0.12%     
==========================================
  Files        1478     1485       +7     
  Lines       88083    88567     +484     
  Branches     4564     4584      +20     
==========================================
+ Hits        86002    86371     +369     
- Misses       2081     2196     +115     

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