chore(transformer): add legacy decorator tests that come from TypeScript

[Dunqing]

Part of #8614

All tests copy over from https://github.com/microsoft/TypeScript/blob/8da951cbb629b648753454872df4e1754982aef1/tests/cases/conformance/decorators/class, in addition, several multi-file tests were also adjusted.

The output is generated by

transpileModule(
  source,
  {
    compilerOptions: {
      target: 'esnext',
      experimentalDecorators: true,
      noEmitHelpers: true
    },
  }
)

and replace all __decorate with babelHelpers.decorate and __param with babelHelpers.decorateParam

[Dunqing]

• chore(transformer): add legacy decorator tests that come from TypeScript #8692 👈 (View in Graphite)
• main

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[Boshen]

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