Deparametrize ChannelManager to infer Signer from its KeysInterface.

[arik-so]

No description provided.

[codecov-commenter]

Codecov Report

Base: 90.72% // Head: 90.71% // Decreases project coverage by -0.01% ⚠️

Coverage data is based on head (2c5dc3b) compared to base (a257906).
Patch coverage: 100.00% of modified lines in pull request are covered.

❗ Current head 2c5dc3b differs from pull request most recent head 5b396c6. Consider uploading reports for the commit 5b396c6 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1797      +/-   ##
==========================================
- Coverage   90.72%   90.71%   -0.02%     
==========================================
  Files          87       87              
  Lines       47374    47374              
  Branches    47374    47374              
==========================================
- Hits        42979    42974       -5     
- Misses       4395     4400       +5     

Impacted Files	Coverage Δ
lightning-background-processor/src/lib.rs	96.23% <ø> (ø)
lightning-block-sync/src/init.rs	90.90% <ø> (ø)
lightning-invoice/src/utils.rs	95.17% <100.00%> (ø)
lightning/src/ln/chanmon_update_fail_tests.rs	97.67% <100.00%> (ø)
lightning/src/ln/channelmanager.rs	85.16% <100.00%> (-0.03%)	⬇️
lightning/src/ln/functional_test_utils.rs	93.44% <100.00%> (ø)
lightning/src/ln/functional_tests.rs	97.02% <100.00%> (-0.05%)	⬇️
lightning/src/ln/onion_route_tests.rs	97.68% <100.00%> (ø)
lightning/src/ln/payment_tests.rs	98.81% <100.00%> (ø)
lightning/src/ln/priv_short_conf_tests.rs	96.66% <100.00%> (ø)
... and 5 more

Help us with your feedback. Take ten seconds to tell us how you rate us. Have a feature suggestion? Share it here.

☔ View full report at Codecov.
📢 Do you have feedback about the report comment? Let us know in this issue.

[TheBlueMatt]

There's a handful of other places we can remove the sign bound (eg in the background processor, I think), but this stands on its own and that can happen later.

[arik-so]

I know, and I saw those places, but figured I'd do them in a separate PR.