Mostly Bazel hacking to get a protoc plugin running against the
proto_library graph. The Python plugin doesn't actually do any RST
generation yet, it just runs against each file and dumps the input
proto.
The tool can be run with:
bazel build //api --aspects \
tools/protodoc/protodoc.bzl%proto_doc_aspect --output_groups=rst
There's a snafu with unsandboxed runs in CI, where I can only get it to
work on direct leaf invocations, will fix this in a followup PR.
Signed-off-by: Harvey Tuch <htuch@google.com>
htuch