Migrate semantic conventions generation to Weaver

[joaopgrassi]

Component

OpenTelemetry.SemanticConventions

Is your feature request related to a problem?

The Semantic conventions repo already made the switch to use Weaver instead of the "old" build-tools. As part of this transition, the semconv group also would like to move all SIGs to also use Weaver for codegen, that is the semantic conventions constants.

We have discussed in the group and want to volunteer work to each language SIG to help them move to Weaver. Since I worked on this package originally, I thought of coming back to it and help with the switch.

Part of: open-telemetry/weaver#227

What is the expected behavior?

Semconv codegen is generated via Weaver

Which alternative solutions or features have you considered?

N/A

Additional context

No response