Log as channel liquidities are/not updated in ProbabilisticScorer

[TheBlueMatt]

Does what it says on the tin. Not a whole lot more, getting visibility into the liquidities assigned in the scorer may be useful to debug stuff in the field if anything goes wrong.

[TheBlueMatt]

I ran into ElementsProject/lightning#5154 which caused me to keep retrying a payment across the same first hop over and over again, as we were trusting our own local state over any scoring data. I still think this is the correct behavior - ultimately my immediate peer is exhibiting a bug and I should close the channel, but the logging was substantially lacking, which is improved here.

[codecov-commenter]

Codecov Report

Merging #1405 (a6ae7ca) into main (03f6550) will decrease coverage by 0.00%.
The diff coverage is 88.88%.

❗ Current head a6ae7ca differs from pull request most recent head 6e298ff. Consider uploading reports for the commit 6e298ff to get more accurate results

@@            Coverage Diff             @@
##             main    #1405      +/-   ##
==========================================
- Coverage   90.84%   90.83%   -0.01%     
==========================================
  Files          74       74              
  Lines       41288    41326      +38     
  Branches    41288    41326      +38     
==========================================
+ Hits        37507    37539      +32     
- Misses       3781     3787       +6     

Impacted Files	Coverage Δ
lightning/src/routing/router.rs	92.42% <0.00%> (-0.08%)	⬇️
lightning/src/routing/scoring.rs	94.36% <96.82%> (-0.01%)	⬇️
lightning/src/ln/onion_utils.rs	95.34% <100.00%> (+0.01%)	⬆️
lightning/src/ln/functional_tests.rs	97.11% <0.00%> (-0.04%)	⬇️

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[TheBlueMatt]

Rebased.

[TheBlueMatt]

CC lightning/bolts#979

[valentinewallace]

LGTM

[vincenzopalazzo]

LGTM!

[TheBlueMatt]

Dropped the log commit as we should actually fix it per #1450 instead of just changing logging.