Add a flag to not raise a typing error in partial
Summary:
Right now, there are certain errors where Hack will check the mode of a file and conditionally raise them. Instead, the goal is to always raise those errors unconditionally, and then users can turn them off in `.hhconfig` for partial files. This is a tool to assist incremental conversion to strict mode.
There remains a long tail of work to always raise the errors mentioned above.
Reviewed By: DavidSnider
Differential Revision:
D21835316
fbshipit-source-id:
15e9a5d12c5b497caade51a03df99fedaa6a0697