optimizer: refactor optimizer

[bohutang]

Summary

• remove unused limit pushdown

Changelog

• Improvement

Related Issues

N/A

Test Plan

Unit Tests
Stateless Tests

[codecov-commenter]

Codecov Report

Merging #561 (2a5eafa) into master (982b58c) will increase coverage by 0%.
The diff coverage is n/a.

@@          Coverage Diff           @@
##           master    #561   +/-   ##
======================================
  Coverage      80%     80%           
======================================
  Files         287     285    -2     
  Lines       13444   13402   -42     
======================================
- Hits        10776   10747   -29     
+ Misses       2668    2655   -13     

Impacted Files	Coverage Δ
fusequery/query/src/optimizers/optimizer.rs	100% <ø> (ø)
common/datavalues/src/data_value.rs	30% <0%> (-1%)	⬇️
fusequery/query/src/sql/plan_parser.rs	77% <0%> (-1%)	⬇️

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