Add spread test cases

[MaryGao]

Cadl Ranch Contribution Checklist:

• I have written a scenario spec
• I have meaningful @scenario names. Someone can look at the list of scenarios and understand what I'm covering.
• I have written a mock API
• I have used @scenarioDocs for extra scenario description and to tell people how to pass my mock api check.

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Latest commit: db3d34e

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@azure-tools/cadl-ranch-specs	Patch

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[chunyu3]

Can we add one more scenario: Spread an Alias which contains model as property?

model Thing {
  @doc("name of the Thing")
  name: string;
  @doc("age of the Thing")
  age: int32;
}

alias ThingAliasWithModel = {
  @path id: string;
  ...Thing;
  @header top: int32;
};

op spreadAliasWithModel( ...ThingAliasWithModel ): OKResponse;

[MaryGao]

@iscai-msft @timotheeguerin @weidongxu-microsoft Could you help review these cases?

[weidongxu-microsoft]

Java should have supported the spread. Not sure about .NET

[lmazuel]

This scenario is ok, this is not a quantum model since this is an alias.

In spirit, should generate something like:

void spreadAliasAsRequestParameter(id: string, x_ms_test_header: string, name: string)

[MaryGao]

Can we add one more scenario: Spread an Alias which contains model as property?

model Thing {
  @doc("name of the Thing")
  name: string;
  @doc("age of the Thing")
  age: int32;
}

alias ThingAliasWithModel = {
  @path id: string;
  ...Thing;
  @header top: int32;
};

op spreadAliasWithModel( ...ThingAliasWithModel ): OKResponse;

Pls notice the case is not updated because the discussion is not finalized #247 (comment)

I updated the comment and removed the cases with discussions over them. Pls help review again.