Add filters on user queries

[tharsheblows]

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Description

This adds the filters described in #811 which allow developers to use custom tables to store, retrieve and manipulate the returned Auth0 data for a user. They mimic, as closely as possible, the filters on the WordPress core filters for getting, updating and deleting metadata.

References

Discussion in #811.

Testing

There are phpunit tests for each of the filters. (Currently you have to apply the patch that's in the WP core issue here).

• [+] This change adds test coverage for new/changed/fixed functionality

Checklist

• I have added documentation for new/changed functionality in this PR or in auth0.com/docs
• [+] All active GitHub checks for tests, formatting, and security are passing
• [+] The correct base branch is being used, if not master

[evansims]

Looks great to me 👍 Sorry for the delay in reviewing but had to fix our test suite up a bit before I could address this. Thanks for your contributions on this, @tharsheblows! Much appreciated!