rustfmt: Run on util/* (2/2)

[tnull]

This is PR 2/2, based on #3324.

The diff is a bit larger for this one, but AFAICT the changes look mostly reasonable (besides the oddity commented below).

FWIW, I had a look at currently open inflight PRs and the conflicts should be minimal if I'm not overlooking something.

[codecov]

Codecov Report

Attention: Patch coverage is 82.14286% with 195 lines in your changes missing coverage. Please review.

Project coverage is 89.56%. Comparing base (bc1931b) to head (572f48c).

Files with missing lines	Patch %	Lines
lightning/src/util/test_channel_signer.rs	48.17%	8 Missing and 77 partials ⚠️
lightning/src/util/test_utils.rs	84.01%	68 Missing and 2 partials ⚠️
lightning/src/util/ser.rs	74.24%	17 Missing ⚠️
lightning/src/util/ser_macros.rs	91.59%	9 Missing and 1 partial ⚠️
lightning/src/util/wakers.rs	93.00%	5 Missing and 2 partials ⚠️
lightning/src/util/transaction_utils.rs	95.71%	3 Missing and 3 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3323      +/-   ##
==========================================
- Coverage   89.62%   89.56%   -0.07%     
==========================================
  Files         127      127              
  Lines      103517   104124     +607     
  Branches   103517   104124     +607     
==========================================
+ Hits        92780    93257     +477     
- Misses       8041     8116      +75     
- Partials     2696     2751      +55     

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[TheBlueMatt]

Ugh, can we split this? 42 commits in one PR is just a lot...

[tnull]

Ugh, can we split this? 42 commits in one PR is just a lot...

Alright, happy to if you prefer (although at least half of these commits are one-line diffs). Now split out ~the first half of commits to #3324.

[tnull]

Rebased after #3327 landed.

[tnull]

Rebased after #3324 landed.

[tnull]

Rebased to resolve minor conflicts.

[tnull]

Rebased once more to resolve minor conflicts.

Any additional comments here after we landed the split-out commits in #3324, @TheBlueMatt ?

[tnull]

Rebased once more to resolve minor conflicts.