chore(ss-bench): add options and clean its doc

[Sunt-ing]

What's changed and what's your intention?

• Add Hummock options
• Clear ss-bench doc

Checklist

• I have written necessary docs and comments
• I have added necessary unit tests and integration tests

Refer to a related PR or issue link (optional)

[MrCroxx]

I'm about to add threshold and capacity options for shared buffer, may be wait for it?

[Sunt-ing]

@MrCroxx OK. Waiting for you.

[codecov]

Codecov Report

Merging #1927 (d8b904b) into main (077d69a) will decrease coverage by 0.01%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##             main    #1927      +/-   ##
==========================================
- Coverage   70.84%   70.83%   -0.02%     
==========================================
  Files         624      624              
  Lines       80027    80041      +14     
==========================================
- Hits        56698    56695       -3     
- Misses      23329    23346      +17     

Flag	Coverage Δ
rust	70.83% <0.00%> (-0.02%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/bench/ss_bench/main.rs	0.70% <0.00%> (-0.08%)	⬇️
src/meta/src/model/barrier.rs	78.57% <0.00%> (-3.58%)	⬇️
src/connector/src/filesystem/file_common.rs	80.44% <0.00%> (-0.45%)	⬇️
src/meta/src/barrier/mod.rs	70.06% <0.00%> (-0.35%)	⬇️

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