feat: Add Permissive Mode

[rkesters]

The PR purpose is to add a Permissive Mode that creates a validator that will remove the any "extra" properties and validate the rest.

Permissive Mode

• Is activated when --generatePermissive and --noExtraProps are both true. Permissive Mode only makes sense when the main validator is set to not allow extra props.
• Will create a new validator called cleanAndValidate that will allow the user to pass an object that has extra props and will validate and return the object with the extras removed.
• Note that cleanAndValidate is NOT pure
• the validate validator is also created and works as before

Other Changes

• Added peer dependency to ajv because the lack of any dep in the package.json was odd and confusing.
• Added output CLI option, this was done to allow for better ergonomics in testing
• Added unit tests.
• Added exported type of AllowedTypeNames when --collection is used, a union of all the type names
• Added exported type of AllowedTypes when --collection is used, a union of all the types
• Added exported overload for validate and cleanAndValidate to accept type of AllowedTypeNames when --collection is used
  • Provides better type ergonomics

[rkesters]

@ForbesLindesay can you take a look?