refactor(optimizer): move some methods into core struct && refactor the join's predicate push down

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What's changed and what's your intention?

• move some methods into core struct
• refactor the join's predicate push down

Checklist For Contributors

• 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 #8455 (f1c3c3c) into main (10ebee3) will decrease coverage by 0.01%.
The diff coverage is 92.34%.

@@            Coverage Diff             @@
##             main    #8455      +/-   ##
==========================================
- Coverage   71.64%   71.63%   -0.01%     
==========================================
  Files        1135     1135              
  Lines      185621   185683      +62     
==========================================
+ Hits       132997   133023      +26     
- Misses      52624    52660      +36     

Flag	Coverage Δ
rust	71.63% <92.34%> (-0.01%)	⬇️

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

Impacted Files	Coverage Δ
...tend/src/optimizer/plan_node/generic/hop_window.rs	92.24% <84.74%> (-7.76%)	⬇️
...c/frontend/src/optimizer/plan_node/generic/join.rs	93.67% <100.00%> (+3.43%)	⬆️
.../frontend/src/optimizer/plan_node/logical_apply.rs	88.09% <100.00%> (-0.26%)	⬇️
...tend/src/optimizer/plan_node/logical_hop_window.rs	99.47% <100.00%> (+3.64%)	⬆️
...c/frontend/src/optimizer/plan_node/logical_join.rs	90.74% <100.00%> (-2.50%)	⬇️
...ntend/src/optimizer/plan_node/stream_hop_window.rs	99.13% <100.00%> (ø)
src/common/src/types/ordered_float.rs	32.62% <0.00%> (-0.20%)	⬇️
src/storage/src/hummock/compactor/mod.rs	80.38% <0.00%> (-0.20%)	⬇️
... and 1 more

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