feat(gateway): redirect ipns b58mh to cid

[hacdias]

Closes ipfs/kubo#9749. Redirects base58 encoded peer IDs to CID under the /ipns namespace.

Sharness will fail here. Kubo PR: ipfs/kubo#9785

[codecov]

Codecov Report

Merging #236 (4bb1a26) into main (dc731ca) will decrease coverage by 0.21%.
The diff coverage is 65.71%.

❗ Current head 4bb1a26 differs from pull request most recent head c3d3dde. Consider uploading reports for the commit c3d3dde to get more accurate results

@@            Coverage Diff             @@
##             main     #236      +/-   ##
==========================================
- Coverage   48.02%   47.82%   -0.21%     
==========================================
  Files         279      273       -6     
  Lines       33439    33221     -218     
==========================================
- Hits        16059    15887     -172     
+ Misses      15694    15646      -48     
- Partials     1686     1688       +2     

Impacted Files	Coverage Δ
gateway/handler.go	57.00% <65.71%> (+0.60%)	⬆️

... and 23 files with indirect coverage changes

[hacdias]

@lidel I updated to use peer.Decode as you asked, but please note that we will be executing this for more cases than before, that is, we will also be executing peer.Decode for Peer IDs that are already CIDv1s. Then, we compare with what we already have and only redirect if they don't match. I also moved the testing to the Kubo PR.

[lidel]

Thanks, I think normalization to base36 reduces confusion (IPNS Names always looking the same).

Good for now, I think we will improve it further when we have time for productizing boxo/ipns as part of ipfs/specs#376.

(not merging yet, as I want to check other PRs and merge in least painful order)