Rename PendingHTLCInfo fields to include msat suffix

[valentinewallace]

Addresses #1840 (comment)

[codecov-commenter]

Codecov Report

Base: 90.79% // Head: 90.79% // Decreases project coverage by -0.00% ⚠️

Coverage data is based on head (246d33d) compared to base (d036400).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1844      +/-   ##
==========================================
- Coverage   90.79%   90.79%   -0.01%     
==========================================
  Files          89       89              
  Lines       47975    47975              
  Branches    47975    47975              
==========================================
- Hits        43561    43560       -1     
- Misses       4414     4415       +1     

Impacted Files	Coverage Δ
lightning/src/ln/channelmanager.rs	85.38% <100.00%> (-0.03%)	⬇️
lightning/src/ln/onion_route_tests.rs	97.58% <100.00%> (ø)
lightning/src/ln/functional_tests.rs	96.94% <0.00%> (-0.02%)	⬇️
lightning-net-tokio/src/lib.rs	77.03% <0.00%> (+0.30%)	⬆️

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