test: Add tests for vls-protocol-signer

Siva Sathyaseelanrequested to merge
sivasathyaseeelan/validating-lightning-signer:test-for-vls-protocol-signer-vls-handler into main

This PR adds new tests for handler.rs in vls-protocol-signer

Filename                                     Regions    Missed Regions     Cover   Functions  Missed Functions  Executed       Lines      Missed Lines     Cover    Branches   Missed Branches     Cover
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vls-protocol-signer/src/approver.rs              314                49    84.39%          26                 3    88.46%         237                34    85.65%           0                 0         -
vls-protocol-signer/src/handler.rs              3779              1020    73.01%         219                62    71.69%        2635               642    75.64%           0                 0         -
vls-protocol-signer/src/util.rs                   60                 0   100.00%           5                 0   100.00%          36                 0   100.00%           0                 0         -
Edited by Siva Sathyaseelan

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