Support File to represent file input and output in request/response body

[lmazuel]

Support for File to make sure generated SDK do not try to parse those bites, or encoded them as base64.

Spec

• Support File to represent file input and output in request/response body Scenario tests #3872
• Support File to represent file input and output in request/response body Scenario tests microsoft/typespec#9549
• Support File to represent file input and output in request/response body TCGC Author doc #3870

Implementation

• Support File to represent file input and output in request/response body TCGC Implementation #3871
• http-client-python Support File to represent file input and output in request/response body Implementation microsoft/typespec#9546
• [http-client-java] Support File to represent file input and output in request/response body Implementation microsoft/typespec#9547
• [http-client-ts] Support File to represent file input and output in request/response body Implementation autorest.typescript#3716
• [http-client-csharp] Support File to represent file input and output in request/response body Implementation microsoft/typespec#9548
• [http-client-go] Support File to represent file input and output in request/response body Implementation autorest.go#1851
• https://github.com/Azure/typespec-cpp/issues/557
• [http-client-rust] Support File to represent file input and output in request/response body Implementation typespec-rust#815