Need to register Raw codec to support cid.Raw

[gammazero]

The Raw codec was previously registered by other packages used in projects that depended on go-libipni, so the problem was not previously seen. Now that the codec is not registered by those packages, projects using go-libipni fail with the error:

could not choose a decoder: no decoder registered for multicodec code 85 (0x55)

when encountering advertisements with CIDs that use cid.Raw. Registering the Raw codec fixes this.

[codecov-commenter]

Codecov Report

Patch coverage has no change and project coverage change: +0.05% 🎉

Comparison is base (4afec9f) 54.34% compared to head (1d8654c) 54.40%.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main      #92      +/-   ##
==========================================
+ Coverage   54.34%   54.40%   +0.05%     
==========================================
  Files          65       65              
  Lines        5150     5150              
==========================================
+ Hits         2799     2802       +3     
+ Misses       2048     2045       -3     
  Partials      303      303              

Files Changed	Coverage Δ
ingest/schema/schema.go	66.66% <ø> (ø)

... and 1 file with indirect coverage changes

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