move index to storage

[jiangzhe]

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[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 44.26877% with 141 lines in your changes missing coverage. Please review.

Project coverage is 73.79%. Comparing base (25b02f3) to head (693361a).

Files with missing lines	Patch %	Lines
doradb-storage/src/latch.rs	57.28%	44 Missing ⚠️
doradb-storage/src/buffer/mod.rs	58.88%	37 Missing ⚠️
doradb-storage/src/index/block_index.rs	0.00%	35 Missing ⚠️
doradb-storage/src/buffer/ptr.rs	0.00%	21 Missing ⚠️
doradb-storage/src/buffer/page.rs	0.00%	4 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #138      +/-   ##
==========================================
+ Coverage   70.66%   73.79%   +3.12%     
==========================================
  Files         131      120      -11     
  Lines       17001    16434     -567     
==========================================
+ Hits        12014    12127     +113     
+ Misses       4987     4307     -680     

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