Add indexer comparer

[ischasny]

This PR adds a comparer between two indexers that can print how far apart the two indexers are.

[codecov-commenter]

Codecov Report

Patch coverage: 0.55% and project coverage change: -1.09 ⚠️

Comparison is base (65753d9) 44.88% compared to head (304abcf) 43.80%.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #338      +/-   ##
==========================================
- Coverage   44.88%   43.80%   -1.09%     
==========================================
  Files          77       78       +1     
  Lines        6191     6369     +178     
==========================================
+ Hits         2779     2790      +11     
- Misses       2976     3145     +169     
+ Partials      436      434       -2     

Impacted Files	Coverage Δ
cmd/provider/compare_indexers.go	0.00% <0.00%> (ø)
cmd/provider/internal/client.go	0.00% <0.00%> (ø)
cmd/provider/provider.go	86.66% <100.00%> (+0.30%)	⬆️
mirror/mirror.go	56.22% <0.00%> (+3.36%)	⬆️

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