refactor(optimizer): refactor agg group key

[chenzl25]

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What's changed and what's your intention?

• Use a FixedBitSet instead of Vec. Resolve Use a set instead of vec to represent the group-by clause in the Agg operator #8388.
• One important point to keep in mind is to use group_key.count_ones(..) instead of group_key.len() when determining the cardinality of the group.
• Remove AggDedupGroupKeyRule.

Checklist For Contributors

• I have written necessary rustdoc comments
• I have added necessary unit tests and integration tests
• I have added fuzzing tests or opened an issue to track them. (Optional, recommended for new SQL features Sqlsmith: Sql feature generation #7934).
• I have demonstrated that backward compatibility is not broken by breaking changes and created issues to track deprecated features to be removed in the future. (Please refer to the issue)
• All checks passed in ./risedev check (or alias, ./risedev c)

Checklist For Reviewers

• I have requested macro/micro-benchmarks as this PR can affect performance substantially, and the results are shown.

Documentation

• My PR DOES NOT contain user-facing changes.

Click here for Documentation

Types of user-facing changes

Please keep the types that apply to your changes, and remove the others.

• Installation and deployment
• Connector (sources & sinks)
• SQL commands, functions, and operators
• RisingWave cluster configuration changes
• Other (please specify in the release note below)

Release note

[codecov]

Codecov Report

Merging #9390 (fe81fa4) into main (02b3b80) will increase coverage by 0.00%.
The diff coverage is 97.15%.

@@           Coverage Diff           @@
##             main    #9390   +/-   ##
=======================================
  Coverage   70.73%   70.73%           
=======================================
  Files        1228     1227    -1     
  Lines      204122   204118    -4     
=======================================
+ Hits       144378   144386    +8     
+ Misses      59744    59732   -12     

Flag	Coverage Δ
rust	70.73% <97.15%> (+<0.01%)	⬆️

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

Impacted Files	Coverage Δ
src/frontend/src/optimizer/logical_optimization.rs	95.63% <ø> (-0.07%)	⬇️
src/frontend/src/optimizer/plan_node/stream.rs	14.22% <0.00%> (ø)
src/frontend/src/optimizer/rule/mod.rs	100.00% <ø> (ø)
...frontend/src/optimizer/plan_node/batch_sort_agg.rs	78.40% <75.00%> (+0.76%)	⬆️
...frontend/src/optimizer/plan_node/batch_hash_agg.rs	84.31% <90.00%> (+4.70%)	⬆️
...rc/frontend/src/optimizer/plan_node/generic/agg.rs	84.35% <96.15%> (+0.11%)	⬆️
...ontend/src/optimizer/plan_node/batch_simple_agg.rs	81.25% <100.00%> (ø)
...rc/frontend/src/optimizer/plan_node/logical_agg.rs	95.51% <100.00%> (-0.23%)	⬇️
...rontend/src/optimizer/plan_node/stream_hash_agg.rs	98.19% <100.00%> (ø)
...src/optimizer/plan_node/stream_local_simple_agg.rs	93.54% <100.00%> (ø)
... and 7 more

... and 4 files with indirect coverage changes

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[st1page]

LGTM

[stdrc]

LGTM!

[ZENOTME]

LGTM