Rename FundingLocked to ChannelReady.

[tnull]

The funding_locked message was renamed to channel_ready as part of the ZeroConf spec PR.

This PR simply implements this spec change.

[tnull]

Squashed to fix check_commits.

[codecov-commenter]

Codecov Report

Merging #1506 (6b96930) into main (a534a5e) will decrease coverage by 0.03%.
The diff coverage is 87.84%.

❗ Current head 6b96930 differs from pull request most recent head be31f5c. Consider uploading reports for the commit be31f5c to get more accurate results

@@            Coverage Diff             @@
##             main    #1506      +/-   ##
==========================================
- Coverage   91.00%   90.97%   -0.04%     
==========================================
  Files          80       80              
  Lines       43396    43396              
  Branches    43396    43396              
==========================================
- Hits        39492    39478      -14     
- Misses       3904     3918      +14     

Impacted Files	Coverage Δ
lightning-net-tokio/src/lib.rs	75.91% <0.00%> (-0.31%)	⬇️
lightning/src/ln/peer_handler.rs	57.06% <0.00%> (ø)
lightning/src/ln/shutdown_tests.rs	96.51% <ø> (ø)
lightning/src/ln/wire.rs	62.92% <0.00%> (ø)
lightning/src/routing/router.rs	92.45% <ø> (ø)
lightning/src/util/events.rs	41.66% <0.00%> (ø)
lightning/src/util/test_utils.rs	78.15% <0.00%> (ø)
lightning/src/ln/channelmanager.rs	84.36% <80.00%> (ø)
lightning/src/ln/channel.rs	88.59% <94.00%> (ø)
lightning-background-processor/src/lib.rs	94.37% <100.00%> (ø)
... and 9 more

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