Could we get the source model as the body parameter from TCGC when a model is spread as parameters?

[ArcturusZhang]

For this typespec:

model Bar {}
model Baz {}
op foo(...Bar): Baz;

the TCGC result gives us a FooRequest as the model of body parameter. Since it is speading model Bar, could we get back the model Bar as the body parameter in this case?
This help us reduce the size of the generated assembly.

We agree that there are cases that returning the original model is not possible, such as an operation with spread of two different models, in those cases, we could still do the FooRequest as body because it is combining the two models.
But we would like to get the model back if the model is there.

[iscai-msft]

closing in favor of #1132

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