feat(storage): add combined SST builder

[zwang28]

What's changed and what's your intention?

Added CombinedGrouping strategy for GroupedSstableBuilder. It combines CompactionGroupGrouping and VirtualNodeGrouping. It will be used to group KVs by (compaction_group_id, parallel_unit_id).

Added tests for all KeyValueGroupingImpl.

Checklist

• I have written necessary docs and comments
• I have added necessary unit tests and integration tests
• All checks passed in ./risedev check (or alias, ./risedev c)

Refer to a related PR or issue link (optional)

#2065

[codecov]

Codecov Report

Merging #3075 (7421f36) into main (9ae9973) will increase coverage by 0.04%.
The diff coverage is 96.44%.

@@            Coverage Diff             @@
##             main    #3075      +/-   ##
==========================================
+ Coverage   73.47%   73.51%   +0.04%     
==========================================
  Files         735      735              
  Lines      100477   100651     +174     
==========================================
+ Hits        73827    73996     +169     
- Misses      26650    26655       +5     

Flag	Coverage Δ
rust	73.51% <96.44%> (+0.04%)	⬆️

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

Impacted Files	Coverage Δ
src/storage/src/hummock/sstable/group_builder.rs	95.81% <96.44%> (+1.65%)	⬆️

📣 Codecov can now indicate which changes are the most critical in Pull Requests. Learn more

[soundOfDestiny]

correctness of code is trivial