tsp, TCGC common layer adoption enhancements

[haolingdong-msft]

Remaining issues that should be done after TCGC supports, TCGC dependency issue is listed in each issue.

Sdkpackage adoption issue: #2665
SdkType adoption issue: #2564

Tasks

Beta Give feedback

1. tsp, support TCGC added endpoint together with user defined endpoint for one client #2912
   +0
   
2. tsp, support filtering API versions #2913
   1 of 1
   +0
   
3. tsp, TCGC adoption, support parameter onClient #2920
   1 of 1
   +0
   
4. tsp, TCGC adoption, Handle optional content-type #2930
   1 of 3
   +0
   
5. TSP, TCGC common layer, use TCGC returned usage #2729
   2 of 2
   +0
   
6. TSP, TCGC common layer, use TCGC returned access #2728
   0 of 2
   +0
   
7. TSP, TCGC adoption, use TCGC returned flag to check whether a sdkMethod is overloaded #2932
   +0
   
8. http-client-java, emitter, TCGC integration, deprecate TCGC's description and details microsoft/typespec#4394
   emitter:client:java +1
   

[haolingdong-msft]

TCGC usage and access case study: https://gist.github.com/haolingdong-msft/df3f25a048baf83d8fabf5206aacc7db
TCGC usage and access case study for spread cases: https://gist.github.com/haolingdong-msft/2d941f452551a6f96e141adbc38ac483