Remove previously deprecated Scorer

[tnull]

This PR simply removes the old Scorer and related primitives that were previously deprecated since version 0.0.105.

[codecov-commenter]

Codecov Report

Merging #1512 (84c94a8) into main (f84ce03) will increase coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #1512      +/-   ##
==========================================
+ Coverage   90.96%   90.98%   +0.01%     
==========================================
  Files          80       80              
  Lines       43409    43166     -243     
  Branches    43409    43166     -243     
==========================================
- Hits        39488    39275     -213     
+ Misses       3921     3891      -30     

Impacted Files	Coverage Δ
lightning/src/routing/router.rs	92.45% <ø> (ø)
lightning/src/routing/scoring.rs	97.08% <ø> (+0.44%)	⬆️
lightning/src/ln/functional_tests.rs	97.16% <0.00%> (+0.26%)	⬆️

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