This commit transforms the looprpc subpackage into a versioned module.
By doing so, projects that rely solely on the generated RPC code from
the proto files will benefit from significantly reduced dependencies
during compilation.
This is needed to update protobuf. Version 1.33 breaks in Go 1.16 with
the following error: "//go:build comment without // +build comment".
Distribution was updated from buster (10) to bookworm (12).
protoc was updated from v3.6.1 to v3.21.12.
To itest our autolooper, we need to be able to trigger dispatch on
demand. This functionality is included in a separate rpc server behind
a dev flag. Since it is unlikely that we need to split loop into
multiple rpc servers, this commit simply adds an additional debug server
rather than opting for a full subserver setup.