feat(frontend): support union and union all.

[chenzl25]

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What's changed and what's your intention?

PLEASE DO NOT LEAVE THIS EMPTY !!!

Please explain IN DETAIL what the changes are in this PR and why they are needed:

• Support Union [ALL] for frontend.
• Add Query and SetOperation to BoundSetExpr and make it consistent with parser.

pub enum BoundSetExpr {
    Select(Box<BoundSelect>),
    Query(Box<BoundQuery>),
    Values(Box<BoundValues>),
    /// UNION/EXCEPT/INTERSECT of two queries
    SetOperation {
        op: BoundSetOperation,
        all: bool,
        left: Box<BoundSetExpr>,
        right: Box<BoundSetExpr>,
    },
}

Checklist

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

Documentation

If your pull request contains user-facing changes, please specify the types of the changes, and create a release note. Otherwise, please feel free to remove this section.

Types of user-facing changes

Please keep the types that apply to your changes, and remove those that do not apply.

• SQL commands, functions, and operators

Release note

• Support UNION sql syntax for batch query.

Refer to a related PR or issue link (optional)

#2912

[codecov]

Codecov Report

Merging #6363 (ec07710) into main (afd39fe) will decrease coverage by 0.04%.
The diff coverage is 59.49%.

@@            Coverage Diff             @@
##             main    #6363      +/-   ##
==========================================
- Coverage   74.36%   74.32%   -0.05%     
==========================================
  Files         955      958       +3     
  Lines      156183   156423     +240     
==========================================
+ Hits       116143   116257     +114     
- Misses      40040    40166     +126     

Flag	Coverage Δ
rust	74.32% <59.49%> (-0.05%)	⬇️

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

Impacted Files	Coverage Δ
src/batch/src/lib.rs	100.00% <ø> (ø)
src/compute/src/rpc/service/config_service.rs	0.00% <0.00%> (ø)
src/compute/src/server.rs	0.00% <0.00%> (ø)
src/ctl/src/cmd_impl/compute.rs	0.00% <0.00%> (ø)
src/ctl/src/lib.rs	0.89% <0.00%> (-0.04%)	⬇️
src/expr/src/lib.rs	100.00% <ø> (ø)
src/expr/src/vector_op/cast.rs	82.39% <0.00%> (-3.36%)	⬇️
src/frontend/src/binder/mod.rs	100.00% <ø> (ø)
...c/frontend/src/optimizer/plan_node/batch_insert.rs	56.81% <0.00%> (-8.98%)	⬇️
...tend/src/optimizer/plan_node/logical_hop_window.rs	99.43% <ø> (ø)
... and 32 more

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