Migrate semantic conventions code generation to weaver

[lmolkova]

Semantic Convention tooling group is deprecating build-tools in favor of new code-generation tool - weaver, see open-telemetry/build-tools#322 for the details.

Build-tools are compatible with the latest version of semantic-convention (1.28.0), but might become incompatible with the future versions of semantic-conventions. New features (such as event definition) are added to the weaver only and won't be supported by the build-tools.

Migration steps are documented here along with some non-normative guidelines on the code organization and artifact stability.

Looking for volunteers and happy to help or provide any additional details.

[kaylareopelle]

Hi @lmolkova! Thanks for raising this issue. @robbkidd is working on incorporating weaver into our semantic conventions gem. See #1651 for the progress so far.

[lmolkova]

Thank you!

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