Add multi-paginator plus validation bugfix

Upgrading

composer require laravel-json-api/laravel --no-update
composer up "laravel-json-api/*"

Changelog

Added

• New MultiPaginator that allows a schema to offer multiple different pagination strategies.

Fixed

• The JSON:API rule validators for the follow query parameter fields all errored if a non-array value was provided. This is now fixed:
  • fields
  • page
  • filter