Some tests for agentk
This MR adds only a small number of tests, focusing on the plumbing rather than tests itself. More will come later.
Mocking gRPC: https://github.com/grpc/grpc-go/blob/master/Documentation/gomock-example.md
gomock: https://github.com/golang/mock
go generate
: https://blog.golang.org/generate, docs https://golang.org/cmd/go/#hdr-Generate_Go_files_by_processing_source
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