refactor: convert encoders to use data blocks

[westonpace]

This is the last of the refactors needed to convert the encoders to working with data blocks.

[broccoliSpicy]

some minor suggestions, all others looks good to me.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 71.79487% with 220 lines in your changes missing coverage. Please review.

Project coverage is 77.88%. Comparing base (c0e1f15) to head (cc64306).

Files with missing lines	Patch %	Lines
...-encoding/src/encodings/physical/block_compress.rs	0.00%	71 Missing ⚠️
rust/lance-encoding/src/encodings/physical/fsst.rs	0.00%	39 Missing ⚠️
rust/lance-encoding/src/data.rs	0.00%	28 Missing ⚠️
...ance-encoding/src/encodings/physical/dictionary.rs	82.75%	10 Missing and 10 partials ⚠️
rust/lance-encoding/src/format.rs	91.60%	9 Missing and 2 partials ⚠️
...ust/lance-encoding/src/encodings/physical/value.rs	60.86%	9 Missing ⚠️
rust/lance-encoding/src/encodings/physical.rs	11.11%	8 Missing ⚠️
...e-encoding/src/encodings/physical/packed_struct.rs	81.39%	3 Missing and 5 partials ⚠️
rust/lance-encoding/src/encoder.rs	75.00%	4 Missing ⚠️
...st/lance-encoding/src/encodings/physical/binary.rs	96.94%	1 Missing and 3 partials ⚠️
... and 7 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2817      +/-   ##
==========================================
- Coverage   78.12%   77.88%   -0.25%     
==========================================
  Files         229      231       +2     
  Lines       70492    70373     -119     
  Branches    70492    70373     -119     
==========================================
- Hits        55073    54807     -266     
- Misses      12305    12444     +139     
- Partials     3114     3122       +8     

Flag	Coverage Δ
unittests	77.88% <71.79%> (-0.25%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.