feat: add support for repetition index to the full zip structural encoding

[westonpace]

No description provided.

[westonpace]

Leaving as draft until #3324 merges

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 81.98614% with 234 lines in your changes missing coverage. Please review.

Project coverage is 78.91%. Comparing base (8fe7147) to head (8a1104c).
Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
rust/lance-encoding/src/repdef.rs	79.60%	91 Missing and 3 partials ⚠️
.../lance-encoding/src/encodings/logical/primitive.rs	87.47%	57 Missing and 6 partials ⚠️
rust/lance-encoding/src/data.rs	13.51%	32 Missing ⚠️
rust/lance-encoding/src/encoder.rs	79.72%	14 Missing and 1 partial ⚠️
...ust/lance-encoding/src/encodings/physical/value.rs	0.00%	12 Missing ⚠️
rust/lance-encoding/src/buffer.rs	60.00%	8 Missing ⚠️
rust/lance-encoding/src/format.rs	0.00%	8 Missing ⚠️
...encoding/src/encodings/physical/fixed_size_list.rs	66.66%	1 Missing ⚠️
rust/lance-encoding/src/utils/bytepack.rs	99.32%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3335      +/-   ##
==========================================
+ Coverage   78.90%   78.91%   +0.01%     
==========================================
  Files         247      248       +1     
  Lines       88263    89275    +1012     
  Branches    88263    89275    +1012     
==========================================
+ Hits        69643    70455     +812     
- Misses      15729    15936     +207     
+ Partials     2891     2884       -7     

Flag	Coverage Δ
unittests	78.91% <81.98%> (+0.01%)	⬆️

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[wjones127]

nice work!