feat: remove async from block_iterator

[zackertypical]

What's changed ?

• remove async from block_iterator.rs
• add bench_block_iter.rs to runkv-storage

TODO

• [x] modify tests for concat_iterator.rs and merge_iterator.rs

Issue link

96

[codecov[bot]]

Codecov Report

Merging #99 (dd5c8e4) into main (f5fd35a) will increase coverage by 0.05%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main      #99      +/-   ##
==========================================
+ Coverage   82.85%   82.91%   +0.05%     
==========================================
  Files          67       67              
  Lines        6545     6566      +21     
==========================================
+ Hits         5423     5444      +21     
  Misses       1122     1122              

Impacted Files	Coverage Δ
storage/src/lsm_tree/components/block.rs	95.32% <100.00%> (ø)
storage/src/lsm_tree/components/sstable.rs	86.14% <100.00%> (ø)
storage/src/lsm_tree/iterator/block_iterator.rs	100.00% <100.00%> (ø)
storage/src/lsm_tree/iterator/concat_iterator.rs	98.52% <100.00%> (ø)
storage/src/lsm_tree/iterator/merge_iterator.rs	100.00% <100.00%> (ø)
storage/src/lsm_tree/iterator/sstable_iterator.rs	94.52% <100.00%> (ø)

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