* Enhance grpc-test-utils and grpc-reverse-proxy to use Resources
This is the second of four PRs in which 6ea70c4b45
has been broken up to facilitate review.
The endgame is to have the non-repudiation prototype merged. The
grpc-test-utils and grpc-server-proxy libraries have been
enhanced to use the ResouceOwner/Resource abstraction to handle
the lifecycle of components, making resource management easier
when testing.
changelog_begin
changelog_end
* Solve shadowing issue with more specific imports
* Address https://github.com/digital-asset/daml/pull/8606#discussion_r563628581