Add LightningPaymentFailedError exception

[callebtc]

Introduce a new exception class for handling failed Lightning payments, improving error management in the payment process.

Todo:

• add test for error code for failed LN payment

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 68.74%. Comparing base (23a706d) to head (eb4b9a7).
Report is 6 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #706      +/-   ##
==========================================
+ Coverage   65.67%   68.74%   +3.07%     
==========================================
  Files          88       88              
  Lines        9513     9539      +26     
==========================================
+ Hits         6248     6558     +310     
+ Misses       3265     2981     -284     

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