Add unittests for generic bindings and durable functions

[Hazhzeng]

Waiting for the durable functions library to be released for the full E2E test

1. Testing if the generic binding is working properly when
   a. When function.json dataType is set to 'string' or 'bytes'
   b. When function.json type has a generic binding name (does not match any of our built-in triggers)
   c. When main.py has proper or no annotation type
2. Ensure durable function's activityTrigger and orchestrationTrigger does not fall into any of the generic bindings

[ankitkumarr]

25 checks? :O