test: Add tests in vls-protocol-client

Siva Sathyaseelanrequested to merge
sivasathyaseeelan/validating-lightning-signer:test-for-vls-protocol-client-lib.rs into main

Introduce unit tests to improve vls-protocol-client coverage

Filename                                     Regions    Missed Regions     Cover   Functions  Missed Functions  Executed       Lines      Missed Lines     Cover    Branches   Missed Branches     Cover
-------------------------------------------------------------
vls-protocol-client/src/dyn_signer.rs            107                28    73.83%          13                 8    38.46%          65                23    64.62%           0                 0         -
vls-protocol-client/src/lib.rs                  2250               177    92.13%         118                17    85.59%        1311               144    89.02%           0                 0         -
Edited by Siva Sathyaseelan

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