add $contains, $contained_by, and $overlap operators

[michalgm]

Summary

Simply adds 3 new array-type operators to OPERATORS and whitelist, as well as documentation

• Tell us about the problem your pull request is solving
  Currently, interacting with array-type fields would require complex and/or queries
• Are there any open issues that are related to this?
  Issue Add array-type operators #235
• Is this PR dependent on PRs in other repos?
  No

Other Information

Tested to confirm queries are written as expected

[daffl]

Thank you! Can we add tests for those as well?

[michalgm]

Odd - could have sworn I commented on this back in November. I looked into adding tests, but since these features only apply to postgres, I couldn't see how to add a test without making postgres a dependency for testing, at least with the current test framework. I based the addition on the ilike operator, which is also postgrest-only. If you give me any pointers on how to properly add tests for these operators, I'm happy to look into it.

[JStuve]

Any update on a release for this feature? Works completely as expect and would like to have this officially!

[michalgm]

Hi - checking in to see if I can get any guidance on what would be needed to get this merged? Thanks!

[carcinocron]

Any guidance on how to use this while we wait on it being merged?

[carcinocron]

this worked:

yarn add https://github.com/michalgm/feathers-knex#c3caff90a63d1bcd07e6f19994139f9ec7220471