Alex Eagle cc23698b48 feat(bazel): wire up prebuilt protoc toolchain (#24115) ...

Upstreamed from my https://github.com/aspect-build/toolchains_protoc which provided this feature outside the protobuf repo.

Adds:
- private API: module_extension + tag `protoc.prebuilt_toolchain` to provide and register toolchain for bzlmod users
- WORKSPACE users can live with the inconvenience of having to create toolchains themselves
- example of proto_library rule with intentionally non-functional cc toolchain, exercising the feature

This needs work with @thesayyn to:
- constrain users to choosing a protoc version agreeing with design doc
https://docs.google.com/document/d/16N-eU-0zHbWmxEuaUAIFTJwQLekIXZ8zIC3K4XDr20E/edit
- also register lang toolchains when the flag is enabled

Work towards #19558

Closes #24115

COPYBARA_INTEGRATE_REVIEW=https://github.com/protocolbuffers/protobuf/pull/24115 from protocolbuffers:alexeagle/use_prebuilt_toolchain b18667d82c
PiperOrigin-RevId: 844859103

2025-12-15 11:43:45 -08:00

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