Migrate from deprecated semconvgen to weaver

[dashpole]

Problem Statement

The OTel community is consolidating on using weaver for generating semantic conventions in language SDKs.

We should migrate from https://pkg.go.dev/go.opentelemetry.io/build-tools/semconvgen to https://github.com/open-telemetry/weaver.

Prior Art

PoC: #5793

[dashpole]

@jsuereth please add any important details here. Is this blocking support for semconv v1.27.0?

[dashpole]

Part of open-telemetry/weaver#227

[jsuereth]

It's not blocking support of 1.27.0, but some kind of handling of 1.27.0 is needed. You can either migrate to weaver now or invest in improving your existing jinja templates now, and still break later.

[dmathieu]

Is this a duplicate of #5668?

[dashpole]

Is this a duplicate of #5668?

Ah, I didn't find that. Closing in favor of #5668