derive Debug for ConfirmationTarget

[MaxFangX]

I found it useful to include a human-readable string for ConfirmationTarget in an error context.

[codecov-commenter]

Codecov Report

Base: 90.68% // Head: 90.71% // Increases project coverage by +0.03% 🎉

Coverage data is based on head (ad4b91d) compared to base (437fa4f).
Patch coverage: 0.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1963      +/-   ##
==========================================
+ Coverage   90.68%   90.71%   +0.03%     
==========================================
  Files          97       97              
  Lines       50577    50577              
  Branches    50577    50577              
==========================================
+ Hits        45866    45883      +17     
+ Misses       4711     4694      -17     

Impacted Files	Coverage Δ
lightning/src/chain/chaininterface.rs	95.65% <0.00%> (ø)
lightning/src/ln/peer_channel_encryptor.rs	93.38% <0.00%> (-0.25%)	⬇️
lightning/src/ln/channelmanager.rs	87.13% <0.00%> (+0.02%)	⬆️
lightning/src/ln/monitor_tests.rs	99.56% <0.00%> (+0.10%)	⬆️
lightning/src/ln/functional_tests.rs	97.03% <0.00%> (+0.11%)	⬆️
lightning/src/chain/channelmonitor.rs	91.03% <0.00%> (+0.19%)	⬆️
lightning-net-tokio/src/lib.rs	77.31% <0.00%> (+0.29%)	⬆️
lightning/src/chain/onchaintx.rs	95.39% <0.00%> (+0.83%)	⬆️

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