End to end API testing for functions invoked while using the antictl commands

[lara29]

Need to write unit test cases to verify the antictl commands and their calls into the grpc server. For this, we'll may need to use the bufconn library to spin up a grpc server using in-memory buffer, similar to the example in this blog: https://harrigan.xyz/blog/testing-go-grpc-server-using-an-in-memory-buffer-with-bufconn/