Add common unit test for the rpc layer

[fengjiachun]

Your question

Now that we have multiple implementations of rpc layer, we need some common unit tests to cover all of them

Your scenes

Your advice

Environment

• SOFAJRaft version:
• JVM version (e.g. java -version):
• OS version (e.g. uname -a):
• Maven version:
• IDE version:

[shibd]

@fengjiachun 我可以试试做这个

[SteNicholas]

@shibd You could work for this after the GRPC implement feature merging into master branch.

[shibd]

@SteNicholas 好的

[fengjiachun]

@shibd it's yours now