modify getters for sstable metadata

[trinity-1686a]

this adds support for limit when ranging over an sstable, and makes a few function read less blocks by leveraging sstable metadata more.

This is ready for review, however I'd like to add tests before merging to make sure no of-by-one slipped in

[codecov-commenter]

Codecov Report

Merging #1793 (070efff) into main (25bad78) will decrease coverage by 0.07%.
The diff coverage is 76.40%.

@@            Coverage Diff             @@
##             main    #1793      +/-   ##
==========================================
- Coverage   94.18%   94.10%   -0.08%     
==========================================
  Files         271      275       +4     
  Lines       51720    51954     +234     
==========================================
+ Hits        48714    48893     +179     
- Misses       3006     3061      +55     

Impacted Files	Coverage Δ
sstable/src/streamer.rs	97.31% <33.33%> (-2.69%)	⬇️
sstable/src/dictionary.rs	72.72% <67.30%> (-2.95%)	⬇️
sstable/src/sstable_index.rs	100.00% <100.00%> (ø)
src/aggregation/agg_result.rs	75.00% <0.00%> (-1.93%)	⬇️
src/aggregation/agg_req.rs	94.03% <0.00%> (-1.21%)	⬇️
src/aggregation/intermediate_agg_result.rs	97.75% <0.00%> (-0.69%)	⬇️
src/aggregation/metric/stats.rs	96.99% <0.00%> (-0.24%)	⬇️
fastfield_codecs/src/null_index/sparse.rs	95.27% <0.00%> (-0.19%)	⬇️
src/schema/schema.rs	98.78% <0.00%> (-0.14%)	⬇️
src/aggregation/bucket/histogram/histogram.rs	99.56% <0.00%> (-0.01%)	⬇️
... and 8 more

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