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Part of #57
Add GitCheckerException for better debuggability. Currently when any of the git command fails, it simply throws RuntimeException without telling which specific command failed.
As mentioned in #442, this part of the code will be deprecated to better alternatives, but I still think each git operation deserves exception of its own for better clarity.
There is still a concern whether checked exception is necessary for git failure. If it is unnecessary, then maybe continue using RuntimeException is fine.