[SEMANTIC CONVENTIONS] Migration to weaver

[marcalff]

Fixes #3089

Changes

Please provide a brief description of the changes here.

For significant contributions please make sure you have completed the following items:

• CHANGELOG.md updated for non-trivial changes
• Unit tests have been added
• Changes in public API reviewed

[netlify]

✅ Deploy Preview for opentelemetry-cpp-api-docs canceled.

Name	Link
🔨 Latest commit	d125af2
🔍 Latest deploy log	https://app.netlify.com/sites/opentelemetry-cpp-api-docs/deploys/6733d8083338d700088ae79c

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 87.85%. Comparing base (497eaf4) to head (d125af2).
Report is 162 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3105      +/-   ##
==========================================
+ Coverage   87.12%   87.85%   +0.73%     
==========================================
  Files         200      195       -5     
  Lines        6109     6136      +27     
==========================================
+ Hits         5322     5390      +68     
+ Misses        787      746      -41     

Files with missing lines	Coverage Δ
sdk/src/resource/resource.cc	96.30% <100.00%> (ø)
sdk/src/resource/resource_detector.cc	100.00% <100.00%> (ø)

... and 108 files with indirect coverage changes

[marcalff]

Reviewers:

Generated code

Code under api/include/opentelemetry/semconv is generated automatically.
There is no need to review each file, just sample a few.

Make sure to review at least:

• file schema_url.h, because it is special
• an xxx_attributes.h file,
• an xxx_metrics.h file.

Weaver generation

All relevant code is under buildscripts/semantic-convention.

Please review:

• file weaver.yaml
• every jinja templates (*.j2 files)
• the generator script

Example of usage

Various examples, tests, sdk files have been updated, and now use the new semconv generated code.

[marcalff]

@open-telemetry/weaver-maintainers @open-telemetry/cpp-maintainers Please review, and provide feedback.

[lquerel]

Very nice use of Weaver. Thank you for this migration.

[lalitb]

Thanks for working on it.