Stability on attributes and events

[jerbly]

For issue #564

Added warnings for missing stability on:

• Attributes
• Enum members in attributes
• Event AnyValues
• Enum members in AnyValues

[codecov]

Codecov Report

Attention: Patch coverage is 65.99327% with 101 lines in your changes missing coverage. Please review.

Project coverage is 73.6%. Comparing base (d2e8947) to head (5aaec64).
Report is 7 commits behind head on main.

Files with missing lines	Patch %	Lines
crates/weaver_resolved_schema/src/lib.rs	68.0%	45 Missing ⚠️
crates/weaver_semconv/src/deprecated.rs	52.3%	20 Missing ⚠️
crates/weaver_common/src/result.rs	0.0%	18 Missing ⚠️
crates/weaver_otel_schema/src/lib.rs	43.7%	9 Missing ⚠️
crates/weaver_resolved_schema/src/catalog.rs	60.0%	4 Missing ⚠️
crates/weaver_common/src/diagnostic.rs	0.0%	2 Missing ⚠️
crates/weaver_resolver/src/registry.rs	84.6%	2 Missing ⚠️
crates/weaver_cache/src/lib.rs	80.0%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##            main    #568     +/-   ##
=======================================
- Coverage   74.5%   73.6%   -1.0%     
=======================================
  Files         51      55      +4     
  Lines       3965    4425    +460     
=======================================
+ Hits        2957    3259    +302     
- Misses      1008    1166    +158     

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[lquerel]

LGTM. Thank you so much!

[lmolkova]

Schema changes LGTM!