* Add depth limit to filtering
* Add depth limit to GraphQL
* Add docs
* Rename environment variable
* Add simple deep filter depth calculation
* Update error message
* Shift fields depth check to base function
* Remove unused var
* Implement GraphQL filter depth
* Add check for _and & _or filters in GraphQL
* Add check for _and & _or filters in REST
* Remove commented code
* Add check for REST filter query
* Add REST tests
* Setup m2m using directus fields
* Add GraphQL tests
* Fix linter error
* Cleanup calculateDepth + add docs/tests
* Remove validator in GraphQL
* Add depth checking for nested sort
* Enable source map to display correct error lines
* Set max relational depth to be at least 2
* Update tests
* Add unit test for deep _sort
* Add minimum value in docs
* Refactor depth validation to be in validateQuery
* Add boolean parameter for calculation of _sort in deep query
* Use array of keys to parse dot notation
Co-authored-by: Rijk van Zanten <rijkvanzanten@me.com>
