feat: bundle the rate limiter HTTP middleware

[rustatian]

Bundle github.com/roadrunner-server/rate-limiter/v6 at v6.0.0-beta.1.

• Register rate_limiter in the default HTTP plugin set.
• Add reference settings and the v3 configuration schema.
• Add an HTTP smoke test that uses the default bundle.

Documentation: roadrunner-server/docs#80.

closes: #934

[codecov]

Codecov Report

❌ Patch coverage is 0% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 34.51%. Comparing base (7ff3883) to head (444e4bf).

Files with missing lines	Patch %	Lines
container/plugins.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2389      +/-   ##
==========================================
- Coverage   34.56%   34.51%   -0.05%     
==========================================
  Files          18       18              
  Lines         758      759       +1     
==========================================
  Hits          262      262              
- Misses        496      497       +1     

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[Copilot]

🟡 Changes recommended

The newly added e2e test’s handling of the cont.Serve() results channel can mask real plugin errors and unexpected shutdowns, so it should be corrected before merging.

Once you've addressed the issues Copilot identified, you can request another Copilot review.

Pull request overview

This PR bundles the github.com/roadrunner-server/rate-limiter/v6 plugin into RoadRunner’s default HTTP middleware set, adds reference configuration and schema support, and introduces an e2e smoke test validating the bundled middleware behavior.

Changes:

• Register the rate limiter plugin in the default container plugin set and add the new dependency to go.mod/go.sum.
• Extend the v3 configuration schema and .rr.yaml reference config with http.rate_limiter settings and a new rate_limiter middleware option.
• Add an e2e HTTP smoke test and fixture config to verify 429 Too Many Requests behavior (including Retry-After and caching headers).

File summaries

File	Description
tests/e2e_http_test.go	Adds an e2e smoke test covering bundled rate_limiter middleware behavior.
tests/configs/.rr-http-rate-limiter.yaml	New e2e fixture config enabling rate_limiter middleware and settings.
schemas/config/3.0.schema.json	Adds rate_limiter middleware enum value and http.rate_limiter configuration schema.
go.mod	Adds the rate-limiter/v6 dependency.
go.sum	Adds checksum entries for rate-limiter/v6 v6.0.0-beta.1.
container/plugins.go	Bundles rate-limiter into the default plugin list.
CHANGELOG.md	Documents the new bundled rate_limiter HTTP middleware.
.rr.yaml	Adds reference settings and documentation for http.rate_limiter.

Review details

• Files reviewed: 7/8 changed files
• Comments generated: 1
• Review effort level: Lite

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