Core deferred binding feature

[liliankasem]

Cherry picking the core pieces of the deferred binding feature, leaving out all extension changes.

• Introduce ModelBindingData models
• Introduce the deferred binding attributes
• Sdk generator changes to implement supportsDeferredBinding metadata property
• Creation of new unit test project for worker extensions

resolves #1702

[surgupta-msft]

Did first pass on the PR to check if all the needed files are included here -- looks good. Will do another pass for reviewing the PR.

Question - what is the plan for bringing in sdk.analyzers and other tests - specially GrpcFunctionDefinitionTests and Metadata generator tests as all the functionality is here but we can't add their tests at this point?

[liliankasem]

Did first pass on the PR to check if all the needed files are included here -- looks good. Will do another pass for reviewing the PR.

Question - what is the plan for bringing in sdk.analyzers and other tests - specially GrpcFunctionDefinitionTests and Metadata generator tests as all the functionality is here but we can't add their tests at this point?

Thanks for confirming Surbhi, I mostly want to make sure everything we need is coming through, but doesn't hurt to do another PR pass just in case and we can address any additional feedback.

For analyzers, I'd like to bring those in with their own PR.
For those tests, a lot of them are tied to an extension so I would like to bring those in as we bring in each extension

[brettsam]

Mostly just a quick question about whether we need a public surface API review on this...