Update Temporal Cloud-API to v0.12.0

[chndler]

What was changed

• Update Temporal cloud-api to v0.12.0
• Add protoc-gen-openapiv2 protos to support api-cloud v0.12.0

Why?

Checklist

1. Closes

2. How was this tested:

3. Any docs updates needed?

---

Note

Medium Risk
Updates protobuf generation inputs by adding a new third-party proto source set and shipping large OpenAPI option protos, which can change generated classes/artifacts and potentially introduce proto name/descriptor conflicts at build time.

Overview
Enables building against Cloud API v0.12.0 by vendoring missing third-party protos.

temporal-serviceclient now includes src/main/proto-thirdparty in the protobuf source set and adds the grpc-gateway protoc-gen-openapiv2 option definitions (annotations.proto, openapiv2.proto) so codegen can resolve OpenAPI/Swagger-related proto extensions.

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[mjameswh]

@chndler This PR adds third party protos, but doesn't modify the cloud protos at all.

Is that really what you meant to do? If so, how are those extra protos useful to us?

[chndler]

@chndler This PR adds third party protos, but doesn't modify the cloud protos at all.

Is that really what you meant to do? If so, how are those extra protos useful to us?

@mjameswh sorry about that, fixed by updating cloud protos