fix(ipns): reading records with raw []byte Value

[lidel]

This PR aims to improve / maximize interop with legacy/alternative IPNS clients by restoring support for []byte CID in Value field and gracefully handling empty Value in scenarios where IPNS is used for its Data field, and not IPFS paths.

• record.Value() will convert a binary CID to a valid path.Path.
• Empty Value() will produce NoopPath (/ipfs/bafkqaaa) to avoid breaking existing code that expects a valid record to always produce a valid content path.
• tests to ensure we test both + error if Value() can't produce a meaningful path

Thank you @ianopolous and @aschmahmann for catching this.

If / once this lands, I'll update phrasing in https://specs.ipfs.tech/ipns/ipns-record/ to make it clear binary CID and empty Value are both allowed.

Aiming to include this in Kubo 0.34.

[codecov]

Codecov Report

Attention: Patch coverage is 84.21053% with 3 lines in your changes missing coverage. Please review.

Project coverage is 60.51%. Comparing base (1ff84ce) to head (c520ac2).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
ipns/record.go	84.21%	2 Missing and 1 partial ⚠️

@@            Coverage Diff             @@
##             main     #830      +/-   ##
==========================================
+ Coverage   60.42%   60.51%   +0.08%     
==========================================
  Files         244      244              
  Lines       31120    31136      +16     
==========================================
+ Hits        18804    18841      +37     
+ Misses      10633    10615      -18     
+ Partials     1683     1680       -3     

Files with missing lines	Coverage Δ
ipns/record.go	69.81% <84.21%> (+1.59%)	⬆️

... and 12 files with indirect coverage changes