pw_rpc: Adds Bazel support for RPC Adds initial support for c++ RPC libraries. This change only supports the raw RPC protocol. Change-Id: Icdecc14f1b8be03120330094793315f807deb3ec Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/43921 Reviewed-by: Wyatt Hepler <hepler@google.com> Commit-Queue: Wyatt Hepler <hepler@google.com>
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