[TCGC] Support new additional properties patten from TypeSpec

[tadelesh]

Clear and concise description of the problem

See: microsoft/typespec#2442

1. Change logic for array/dict judgement
2. Change anonymous model naming path finding logic

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.