LSPS5 -> more follow ups

[martinsaposnic]

Addressing comments #3662 (comment), #3662 (comment) and lightning/blips#55 (comment)

Changes:

• lightning-liquidity README is updated
• We stop logging at the Error / Info level when the client / manager is dealing with unknown peers, unknown request IDs, missing handlers, etc

[ldk-reviews-bot]

👋 Thanks for assigning @tnull as a reviewer!
I'll wait for their review and will help manage the review process.
Once they submit their review, I'll check if a second reviewer would be helpful.

[tnull]

LGTM

I think at some point we need to more fundamentally rethink our logging scheme (e.g., not sure if we should start logging at ERROR for some of the more unlikely/severe cases). but this is a clear improvement for now.

[ldk-reviews-bot]

👋 The first review has been submitted!

Do you think this PR is ready for a second reviewer? If so, click here to assign a second reviewer.

[codecov]

Codecov Report

❌ Patch coverage is 22.22222% with 14 lines in your changes missing coverage. Please review.
✅ Project coverage is 88.93%. Comparing base (bb48bbc) to head (7782e3d).
⚠️ Report is 12 commits behind head on main.

Files with missing lines	Patch %	Lines
lightning-liquidity/src/manager.rs	0.00%	7 Missing ⚠️
lightning-liquidity/src/lsps2/client.rs	25.00%	6 Missing ⚠️
lightning-liquidity/src/lsps5/client.rs	66.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3972      +/-   ##
==========================================
- Coverage   88.93%   88.93%   -0.01%     
==========================================
  Files         174      174              
  Lines      123875   123880       +5     
  Branches   123875   123880       +5     
==========================================
+ Hits       110169   110171       +2     
- Misses      11253    11259       +6     
+ Partials     2453     2450       -3     

Flag	Coverage Δ
fuzzing	22.62% <0.00%> (+0.44%)	⬆️
tests	88.76% <22.22%> (-0.01%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.