Add function for updating network graph with announcement with no UTXO resolver

[benthecarman]

This trivial implementation would be nice to have for implementations that are passing in None when calling network_graph.update_channel_from_announcement as the compiler needs a type to infer. Today the user needs to create their own dummy impl of UtxoLookup when they could just use this one.

[codecov-commenter]

Codecov Report

Patch coverage has no change and project coverage change: -0.03 ⚠️

Comparison is base (bc54441) 91.57% compared to head (09e29c8) 91.55%.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2222      +/-   ##
==========================================
- Coverage   91.57%   91.55%   -0.03%     
==========================================
  Files         104      104              
  Lines       51553    51745     +192     
  Branches    51553    51745     +192     
==========================================
+ Hits        47212    47377     +165     
- Misses       4341     4368      +27     

Impacted Files	Coverage Δ
lightning/src/routing/gossip.rs	89.90% <ø> (ø)
lightning/src/routing/utxo.rs	91.90% <ø> (ø)

... and 20 files with indirect coverage changes

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[TheBlueMatt]

Can we just expose a wrapper around update_channel_from_announcement instead?

[benthecarman]

Can we just expose a wrapper around update_channel_from_announcement instead?

That's a much better idea

[TheBlueMatt]

Oops I guess we should have landed this for 115. Oh well.