Switch Key Vault library to be based on TypeSpec

[RickWinter]

Goal here is to generate the libraries from TSPs while we want to maintain surface area.

There are two primary objectives from this work:

1. Add support in dataplane for generating libraries using the TypeSpec-Go generator
2. Convert KeyVault library to generate from TypeSpec

For repo infrastructure we need to do the following:

• Add Support to go generate for TypeSpec

For each library (Secrets / Keys / Certs / Admin) we will need to do the following:

• go build TSP generation | 2 days
• Add language customizations to the TSP files in rest-api-specs repo | 5 days