feature(std-http-server): option to inject request metadata into context

[chaseisabelle]

Added an option to inject request metadata into the context for the std-http-server. This will be useful for downstream logging, metrics, tracing, observability, and custom authorization implementations.

Checklist:

• All make commands (tidy, test, generate, and lint) have been run ✅
• Default is false/off to preserve existing behavior ✅
• Added test cases and mock std-http-server ✅
• Generated code has been committed for review ✅

Example:

// set the option to enable metadata context injection
han := oapi.HandlerWithOptions(srv, StdHTTPServerOptions{
  WithRequestMetadata: true,
})

// get the injected metadata from the context 
md := oapi.RequestMetadataFromContext(ctx)

opID := md.OperationID
path := md.RequestRoute

[kusari-inspector[bot]]

Kusari Analysis Results:

✅ No Flagged Issues Detected All values appear to be within acceptable risk parameters.

No pinned version dependency changes, code issues or exposed secrets detected!

[!NOTE] View full detailed analysis result for more information on the output and the checks that were run.

---

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[kusari-inspector[bot]]

Kusari PR Analysis rerun based on - c19ae607bfd14104cbb49f8124b541d6588f0cde performed at: 2025-09-13T21:06:03Z - link to updated analysis

[kusari-inspector[bot]]

Kusari PR Analysis rerun based on - 54c773c31bfdb55557dbb19413cd091ca8ad3293 performed at: 2025-09-28T04:17:03Z - link to updated analysis