Make rest_parse_request_arg the default sanitize_callback for params
|Reported by:||joehoyle||Owned by:||joehoyle|
As our support for validating and sanitizing has got better, we are making use of it more and more throughout the codebase. Already rest_parse_request_arg (which does all the auto validation / sanitization) is used for the schema in get_item_schema, it makes sense to just make rest_parse_request_arg the default sanitizer for all params if a type is specified in the options.
This could be disabled with sanitize_callback => false etc.