Previously, pw_software_update only had a nanopb RPC
BundledUpdateService. This commit adds a new version of the service that
uses pw_protobuf RPC.
The service was essentially copy-pasted from the nanopb version, with
changes made to the RPC method handlers to use all of the new types.
Change-Id: Ib561407e50bbe1ff953439be4b570e08e8587b6a
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/104866
Reviewed-by: Ali Zhang <alizhang@google.com>
Commit-Queue: Eli Lipsitz <elipsitz@google.com>
