Add a new filter stage for modifying input formatter collection.

[harshgMSFT]

The decision here is to add a new filter stage that will surround:

1. Exception Filter > Model Binding > Action Filter > Action
2. Result Filter > Result

Working name is Resource Filter.

Primary scenario here is to support modifications to the inputs to model binding. Anything else where you need to surround the whole action and result is a good candidate to also use this stage.

See diagram:

How to expose input formatters:
Option 1. As an auth filter
Option 2. As a new filter stage which runs after auth and before deserialization.
Option 3. Implement as an action filter and let the deserialization be lazy.

[harshgMSFT]

The call is to expose a new filter stage which runs after auth and before deserialization. Changing the title to reflect the same.

[rynowak]

5ac5c53