Implement Compression Algorithm Advertisement

[TheBlueMatt]

As specified by lightning/bolts#825

[codecov]

Codecov Report

Merging #1015 (28b9726) into main (1beccf1) will increase coverage by 0.03%.
The diff coverage is 98.40%.

❗ Current head 28b9726 differs from pull request most recent head 03ceb33. Consider uploading reports for the commit 03ceb33 to get more accurate results

@@            Coverage Diff             @@
##             main    #1015      +/-   ##
==========================================
+ Coverage   90.29%   90.32%   +0.03%     
==========================================
  Files          70       70              
  Lines       36624    36626       +2     
==========================================
+ Hits        33070    33084      +14     
+ Misses       3554     3542      -12     

Impacted Files	Coverage Δ
lightning/src/routing/network_graph.rs	91.33% <91.30%> (-0.02%)	⬇️
lightning-background-processor/src/lib.rs	94.95% <100.00%> (-0.05%)	⬇️
lightning/src/ln/chanmon_update_fail_tests.rs	97.65% <100.00%> (ø)
lightning/src/ln/channelmanager.rs	83.73% <100.00%> (+0.04%)	⬆️
lightning/src/ln/features.rs	99.42% <100.00%> (-0.06%)	⬇️
lightning/src/ln/functional_test_utils.rs	95.13% <100.00%> (ø)
lightning/src/ln/functional_tests.rs	97.27% <100.00%> (-0.04%)	⬇️
lightning/src/ln/msgs.rs	86.57% <100.00%> (+0.23%)	⬆️
lightning/src/ln/payment_tests.rs	99.10% <100.00%> (ø)
lightning/src/ln/peer_handler.rs	49.77% <100.00%> (ø)
... and 15 more

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 1beccf1...03ceb33. Read the comment docs.

[TheBlueMatt]

Closing cause it looks like the BOLT PR isn't gonna go anywhere, ideally we'll end up with lightning/bolts#981 instead and we don't have to do anything.