perf(skip masks): skip masks as roaring bitmaps in fetch

[forshev]

Description

Read skip masks as roaring bitmap for fetch

Fixes #420

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[codecov-commenter]

Codecov Report

❌ Patch coverage is 65.65657% with 34 lines in your changes missing coverage. Please review.
✅ Project coverage is 70.60%. Comparing base (e0cf437) to head (ab18105).

Files with missing lines	Patch %	Lines
skipmaskmanager/loader.go	54.28%	11 Missing and 5 partials ⚠️
skipmaskmanager/encoding.go	58.33%	10 Missing ⚠️
skipmaskmanager/skip_mask_manager.go	76.19%	3 Missing and 2 partials ⚠️
skipmaskmanager/iterator_asc.go	83.33%	1 Missing ⚠️
skipmaskmanager/iterator_desc.go	83.33%	1 Missing ⚠️
skipmaskmanager/merged_iterator.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #421      +/-   ##
==========================================
- Coverage   70.65%   70.60%   -0.05%     
==========================================
  Files         219      219              
  Lines       16967    16998      +31     
==========================================
+ Hits        11988    12002      +14     
- Misses       4084     4096      +12     
- Partials      895      900       +5     

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