Trie leaf iterate

[asdacap]

• Add ability to iterate trie leaf.
• Important for snap sync.
• Make it easier to make range proof tests.
• Uses a consumer func, as the stop condition can be complicated.
  • I guess you can convert it to iter.Seq2[KV, err] if you want.
• Can be optimized, but unlikely to make much of a difference.

[codecov]

Codecov Report

Attention: Patch coverage is 76.47059% with 8 lines in your changes missing coverage. Please review.

Project coverage is 75.39%. Comparing base (4e6dcd7) to head (b614c2e).
Report is 107 commits behind head on main.

Files	Patch %	Lines
core/trie/trie.go	71.42%	3 Missing and 3 partials ⚠️
core/trie/key.go	84.61%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1907      +/-   ##
==========================================
- Coverage   75.43%   75.39%   -0.05%     
==========================================
  Files          97       97              
  Lines        8342     8376      +34     
==========================================
+ Hits         6293     6315      +22     
- Misses       1519     1526       +7     
- Partials      530      535       +5     

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[pnowosie]

👍 Looks good to me ;)

[derrix060]

it would be nice to write a test that meets this condition :)

[pnowosie]

Closing. This is already part of #2035 and then we will continue from that one.