feat(api): accept quoted-key fields in otel logging macros

[cijothomas]

Changes $key:ident to $key:tt in the otel_info!, otel_warn!, otel_debug!, and otel_error! macro arms. This allows dotted attribute names like "otel.component.type" = "value" which are required by SDK self-observability semantic conventions (open-telemetry/semantic-conventions#3723).

Existing callers using plain ident keys continue to work unchanged — tt matches both identifiers and string literals. The #[cfg(test)] print branch also works: stringify! on a string-literal tt produces the quoted form (e.g. "otel.component.type"=value), which is still readable debug output.

Once this lands, the shutdown-event POC (#3552) can switch from opentelemetry::_private::info! to the public otel_info! macro.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 83.0%. Comparing base (fb2af9d) to head (7c3b0d8).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@          Coverage Diff          @@
##            main   #3567   +/-   ##
=====================================
  Coverage   83.0%   83.0%           
=====================================
  Files        130     130           
  Lines      27952   27952           
=====================================
  Hits       23210   23210           
  Misses      4742    4742           

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[Copilot]

Pull request overview

This PR updates the public otel_info!, otel_warn!, otel_debug!, and otel_error! macros in the opentelemetry crate to accept quoted attribute keys (string literals) in addition to identifier keys, enabling semantic-convention attribute names like "otel.component.type" for internal/self-observability logging.

Changes:

• Relax macro field-key matching from $key:ident to $key:tt for the key/value field arms.
• Preserve existing behavior for identifier keys while enabling string-literal keys in the same call sites.
• Keep the existing #[cfg(test)] stdout-print behavior (via stringify!($key)).

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[bantonsson]

I think that there should be a CHANGELOG entry for this.

[cijothomas]

I think that there should be a CHANGELOG entry for this.

Added.