Add --typed-overrides option to the annotations command

[Morriar]

Motivation

Sometimes the annotations files pulled by Tapioca will create type errors in your project because of incompatibilities.
It is possible to ignore such files by switching their strictness level --typed-overrides option:

$ bin/tapioca annotations --typed-overrides gemA:ignore gemB:false

Or through the configuration file:

annotations:
  typed_overrides:
    gemA: "ignore"
    gemB: "false"

Fixes #961.

Tests

See automated tests.