feat(ipld): undeprecate for_each methods for hamt/kamt

[Stebalien]

These are useful because they handle some error cases and the ranged version is especially useful as using iter + skip etc. is actually kind of annoying. It would still be better to replace these with iterators in many cases, but replacing them everywhere is annoying and not worth the effort.

[Stebalien]

The downside of keeping these functions is that we won't be able to remove the anyhow errors.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 75.72%. Comparing base (d76ae62) to head (a548be6).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2080      +/-   ##
==========================================
- Coverage   75.73%   75.72%   -0.01%     
==========================================
  Files         154      154              
  Lines       15691    15689       -2     
==========================================
- Hits        11883    11881       -2     
  Misses       3808     3808              

Files with missing lines	Coverage Δ
ipld/amt/src/amt.rs	83.39% <ø> (ø)
ipld/amt/src/iter.rs	95.80% <ø> (-0.03%)	⬇️
ipld/kamt/src/kamt.rs	84.78% <ø> (ø)

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