Add Clone to a few structs which contain only a few fields

[TheBlueMatt]

Specifically, PhantomRouteHints, FixedPenaltyScorer, and
ScoringParamters.

[codecov-commenter]

Codecov Report

Merging #1346 (60f7977) into main (6259e7a) will decrease coverage by 0.03%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##             main    #1346      +/-   ##
==========================================
- Coverage   90.60%   90.57%   -0.04%     
==========================================
  Files          72       72              
  Lines       40075    40087      +12     
==========================================
- Hits        36310    36308       -2     
- Misses       3765     3779      +14     

Impacted Files	Coverage Δ
lightning/src/ln/channelmanager.rs	84.60% <0.00%> (-0.10%)	⬇️
lightning/src/routing/scoring.rs	94.16% <0.00%> (-0.87%)	⬇️
lightning/src/ln/functional_tests.rs	97.10% <0.00%> (-0.04%)	⬇️

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