Adding more Typing information as generated using monkeytype

[vrdmr]

Description

Adding more Typing information as generated using monkeytype.

Get Monkeytype to go through all the functions as invoked by the pytest. This is done by the following-

CORE_TOOLS_EXE_PATH=/usr/local/bin/func monkeytype run `which pytest` --instafail tests/unittests

The above generates a database of all the functions calls and stores it in monkeytype.sqlite3 file. You can get the list of all the modules indexed by the MonkeyType by the following command:

(venv) bash-3.2$ monkeytype list-modules
...
azure_functions_worker.utils.wrappers
azure_functions_worker.utils.tracing
azure_functions_worker.utils.common
azure_functions_worker.testutils
azure_functions_worker.protos.FunctionRpc_pb2_grpc
azure_functions_worker.logging
azure_functions_worker.loader
azure_functions_worker.functions
azure_functions_worker.dispatcher
azure_functions_worker.bindings.tracecontext
azure_functions_worker.bindings.out
azure_functions_worker.bindings.meta
azure_functions_worker.bindings.generic
azure_functions_worker.bindings.datumdef
azure_functions_worker._thirdparty.typing_inspect
...

Applying the MonkeyType information

monkeytype apply <module>

Also - In the PR, I did some very minor fixes in the exposure - I'll mark them in the review.

Fixes #704

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