Automate the generation of Go code based on upstream releases

[MrAlias]

When an upstream release of the proto is made use a GitHub action to generate the Go code using this repos tooling and submit a PR for review. Additionally, have automation built that will make a release of this repo when a new tagged version is merged to main.

[MadVikingGod]

To accommodate the wish to keep our code generation separate from the opentelemetry-proto repository I think this should just be accomplished by a scheduled workflow that checks for a new version tag, and updates to it to make a PR.

If there is any reasonable way to signal if a change has broken the go compatibility promises, I would schedule a workflow to check if main is still compatible with the last release.