Implement Debug for MonitorUpdateId

[benthecarman]

Playing around with 117 and trying to log MonitorUpdateId but can't because it doesn't implement Debug

[codecov-commenter]

Codecov Report

Patch coverage has no change and project coverage change: -0.09% ⚠️

Comparison is base (a37a16a) 88.86% compared to head (66821a9) 88.78%.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2594      +/-   ##
==========================================
- Coverage   88.86%   88.78%   -0.09%     
==========================================
  Files         113      113              
  Lines       84419    84419              
  Branches    84419    84419              
==========================================
- Hits        75022    74951      -71     
- Misses       7197     7256      +59     
- Partials     2200     2212      +12     

Files Changed	Coverage Δ
lightning/src/chain/chainmonitor.rs	89.24% <0.00%> (-0.21%)	⬇️

... and 9 files with indirect coverage changes

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