Binder models tcgc

[joheredi]

Summary of Changes in this PR

1. use binder to manage model references
2. deserializer support. fixes Fill in gaps for Deserialization #2625
3. refactor of the operation helper in both serialization and deserialization. partially fix Serialization Followup work #2619 combine the previous serializeUtils/deserializer logic with serializer/deserializer.
4. sdkPackage.models related adoption. Implement TCGC's SdkPackage types #2406
5. client initialization adoption fixes Support client-level parameter defined @clientInitialization #2795
6. use tcgc generated name for anonymous model
7. rename RLC context name with tcgc client name.
8. stop normalize the property name, fixes Should we cast property name automatically in modular? #2645
9. refactor of all unit test to take options parameter instead of introducing long signature list.
10. modular models for multiclient support. fixes revisit modular models generation in multi clients #2611
    a. generate one copy of models outside of the subclient folder of multi-client case.
    b. move operation options inside the api folder.

TCGC related issues

1. [Bug]: should we have apiVersion lifted to client initialization if not all operation has this parameter? typespec-azure#1595
2. [Bug]: EnumMember type as a clientDefaultValue? typespec-azure#1598
3. [Bug]: Discriminated subtype is missing in models from sdkPackages  typespec-azure#1605
4. [Bug]: fail to extract clientDefaultValue for apiVersion in server  typespec-azure#1608
5. [Bug]: type existence check return false for the same union type in tcgc typespec-azure#1677
6. [Bug]: usage is incorrect for lro initial response model typespec-azure#1678

[MaryGao]

LGTM!

[dgetu]