Support atomic partial updates to ChannelConfig

[wvanlint]

No description provided.

[codecov-commenter]

Codecov Report

Patch coverage: 95.83% and project coverage change: -0.01 ⚠️

Comparison is base (fb140b5) 90.34% compared to head (7b22e7b) 90.34%.

❗ Current head 7b22e7b differs from pull request most recent head 8fd8966. Consider uploading reports for the commit 8fd8966 to get more accurate results

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Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2330      +/-   ##
==========================================
- Coverage   90.34%   90.34%   -0.01%     
==========================================
  Files         104      104              
  Lines       53392    53461      +69     
  Branches    53392    53461      +69     
==========================================
+ Hits        48237    48298      +61     
- Misses       5155     5163       +8     

Impacted Files	Coverage Δ
lightning/src/ln/channelmanager.rs	86.37% <93.87%> (+0.08%)	⬆️
lightning/src/util/config.rs	58.33% <100.00%> (+15.71%)	⬆️

... and 3 files with indirect coverage changes

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[TheBlueMatt]

Thanks! Please squash the fixup commit down when you next push!