feat: support stream in spring data repository

[shouwn]

Motivation

• Spring Data supports a stream as a return type.

Modifications

• Add the findStream() functions to make the stream available in the repository.

Result

• Users will be able to use the stream when using the findStream() method of the KotlinJdslJpqlExecutor interface.
• Close Do you support Stream Query? (Stream 쿼리를 지원하나요?) #802

employeeRepository.findStream {
    selectNew<Row>(
        path(EmployeeDepartment::departmentId),
        count(Employee::employeeId),
    ).from(
        entity(Employee::class),
        join(Employee::departments),
    ).groupBy(
        path(EmployeeDepartment::departmentId),
    ).orderBy(
        path(EmployeeDepartment::departmentId).asc(),
    )
}

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 80.00000% with 8 lines in your changes missing coverage. Please review.

Project coverage is 90.54%. Comparing base (3a58ff8) to head (2f2835f).
Report is 5 commits behind head on main.

Files with missing lines	Patch %	Lines
...ata/jpa/javax/repository/KotlinJdslJpqlExecutor.kt	33.33%	4 Missing ⚠️
...ring/data/jpa/repository/KotlinJdslJpqlExecutor.kt	33.33%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #803      +/-   ##
==========================================
- Coverage   90.69%   90.54%   -0.16%     
==========================================
  Files         337      337              
  Lines        3536     3564      +28     
  Branches      221      221              
==========================================
+ Hits         3207     3227      +20     
- Misses        261      269       +8     
  Partials       68       68              

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[cj848]

I didn't think about the part where offset, limit are given as optional or the part where pageable is included, but I'm impressed by your meticulousness. This is LGTM.

But if you look at the PR result, it says findAll. It looks like a typo, but is it correct?

--- korean
offset, limit 을 optional 로 주는 부분이나 pageable 들어가는 부분은 생각 못했었는데 꼼꼼함에 감탄합니다 ㅎㅎ LGTM 입니다.

그런데 PR result 쪽에 보면 findAll로 되어있네요. 오타로 보이는데 맞을까요?

[cj848]

And if possible, it would be nice to also add a gitbook manual.

--- korean
그리고 가능하다면 gitbook 메뉴얼도 추가되면 좋을것 같습니다.