feat: foyer storage bench support flexible writers and readers

[MrCroxx]

Signed-off-by: MrCroxx mrcroxx@outlook.com

[codecov-commenter]

Codecov Report

Merging #31 (1c92bc3) into main (8388de6) will decrease coverage by 11.45%.
The diff coverage is 0.00%.

@@             Coverage Diff             @@
##             main      #31       +/-   ##
===========================================
- Coverage   52.01%   40.57%   -11.45%     
===========================================
  Files          45       32       -13     
  Lines        5306     3088     -2218     
===========================================
- Hits         2760     1253     -1507     
+ Misses       2546     1835      -711     

Impacted Files	Coverage Δ
foyer-common/src/bits.rs	51.72% <ø> (ø)
foyer-common/src/code.rs	0.00% <0.00%> (ø)
foyer-common/src/lib.rs	100.00% <ø> (+97.50%)	⬆️
foyer-common/src/queue.rs	0.00% <ø> (ø)
foyer-intrusive/src/core/adapter.rs	97.56% <ø> (ø)
foyer-storage-bench/src/main.rs	0.33% <0.00%> (-0.04%)	⬇️
foyer-storage/src/admission.rs	0.00% <ø> (ø)
foyer-storage/src/device/io_buffer.rs	97.43% <ø> (ø)
foyer-storage/src/flusher.rs	0.00% <ø> (ø)
foyer-storage/src/indices.rs	0.00% <ø> (ø)
... and 5 more

... and 1 file with indirect coverage changes