feat(tcgc): SdkModelPropertyTypeBase.clientDefaultValue should be a concrete type

[archerzz]

Clear and concise description of the problem

Right now, SdkModelPropertyTypeBase.clientDefaultValue is of type any:

typespec-azure/packages/typespec-client-generator-core/src/interfaces.ts

Line 334 in fe90e20

clientDefaultValue?: any;

I think it should be a more concrete type, like SdkConstantType:

typespec-azure/packages/typespec-client-generator-core/src/interfaces.ts

Line 269 in fe90e20

export interface SdkConstantType extends SdkTypeBase {

Otherwise, it would be hard for emitters to determine the type of default value.

Checklist

• Follow our Code of Conduct
• Check that this issue is about the Azure libraries for typespec. For feature request in the typespec language or core libraries file it in the TypeSpec repo
• Read the docs.
• Check that there isn't already an issue that request the same feature to avoid creating a duplicate.

[archerzz]

close, per discussion, we thought the corresponding type property should be used to parse the value