Writing test cases to test CHIPS RPC's used in bet

[sg777]

In order to port the upstream changes frequently into the CHIPS repo, so need to have an easy way to test any change in CHIPS RPC functionalities.

The idea is write test cases that covers all the RPC calls used in bet.

The test cases should cover change in RPC functionalities, and change in i/p and o/p params of the RPCs.

[sg777]

@imylomylo has been writing test cases skeleton here: https://github.com/imylomylo/verus-release-testing-mylo/blob/main/test_stuff.py which we can refer while writing the test cases to test CHIPS and LN RPC's.