Remove support for libp2p find client

[gammazero]

Part of fix for ipni/storetheindex#1842

[codecov-commenter]

Codecov Report

Patch coverage has no change and project coverage change: +1.51 🎉

Comparison is base (dfad9b3) 51.42% compared to head (3bd3bd2) 52.93%.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main      #45      +/-   ##
==========================================
+ Coverage   51.42%   52.93%   +1.51%     
==========================================
  Files          60       59       -1     
  Lines        4988     4813     -175     
==========================================
- Hits         2565     2548      -17     
+ Misses       2150     1994     -156     
+ Partials      273      271       -2     

Impacted Files	Coverage Δ
find/client/client.go	0.00% <ø> (ø)
find/client/dhash_client.go	0.00% <ø> (ø)
find/client/http/old_client.go	0.00% <0.00%> (ø)
find/client/option.go	0.00% <ø> (ø)
find/client/provider_cache.go	0.00% <ø> (ø)

... and 3 files with indirect coverage changes

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