feat: expose native OSS from package

[ghostoy]

Checklist

• npm test passes
• tests and/or benchmarks are included
• documentation is changed or added
• commit message follows commit guidelines

Affected core subsystem(s)

oss

Description of change

在某些情况下，不引用OSS的返回值类型的时候会报TS2742错误。

这个补丁导出了@midwayjs/oss内的原生OSS对象和类型，可以避免上述问题，同时也避免引入额外的ali-oss依赖。

import { OSS, OSSService } from '@midwayjs/oss';
import { Inject } from '@midayjs/core';

@Provide()
export class MyService {
  @Inject()
  ossService: OSSService;

  async deleteMulti(keys: string[]): Promise<OSS.DeleteMultiResult> {
    // 如果不声明返回值类型会报TS2742错误
    return await this.ossService.deleteMulti(keys, { quiet: true });
  }
}

[codecov-commenter]

Codecov Report

Patch coverage: 100.00% and project coverage change: -0.15% ⚠️

Comparison is base (c6d8317) 81.83% compared to head (166f679) 81.69%.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3132      +/-   ##
==========================================
- Coverage   81.83%   81.69%   -0.15%     
==========================================
  Files         438      439       +1     
  Lines       15936    15938       +2     
  Branches     3773     3773              
==========================================
- Hits        13042    13020      -22     
- Misses       2626     2645      +19     
- Partials      268      273       +5     

Files Changed	Coverage Δ
packages/oss/src/interface.ts	100.00% <100.00%> (ø)

... and 3 files with indirect coverage changes

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