routing/http: return PeerRecord for FindPeers

[hacdias]

/routing/v1/peers always returns peer schema conforming objects: https://specs.ipfs.tech/routing/http-routing-v1/#response-body-0.

This makes it easier for the consumers of the library.

[codecov]

Codecov Report

Merging #490 (256374c) into main (aa6fa14) will decrease coverage by 0.12%.
The diff coverage is 67.69%.

❗ Current head 256374c differs from pull request most recent head 5b2fc58. Consider uploading reports for the commit 5b2fc58 to get more accurate results

@@            Coverage Diff             @@
##             main     #490      +/-   ##
==========================================
- Coverage   65.77%   65.66%   -0.12%     
==========================================
  Files         207      207              
  Lines       25130    25167      +37     
==========================================
- Hits        16529    16525       -4     
- Misses       7140     7171      +31     
- Partials     1461     1471      +10     

Files	Coverage Δ
routing/http/client/client.go	74.59% <100.00%> (ø)
routing/http/server/server.go	67.45% <100.00%> (ø)
routing/http/types/json/responses.go	45.45% <ø> (ø)
routing/http/contentrouter/contentrouter.go	49.13% <71.42%> (+1.04%)	⬆️
routing/http/types/ndjson/records.go	55.10% <57.89%> (+1.76%)	⬆️
examples/routing/delegated-routing-client/main.go	54.38% <62.06%> (+2.83%)	⬆️

... and 14 files with indirect coverage changes