feat: support sortBy on joined table

[mlecoq]

Currently if we make a query with joined tables, we cannot sort on columns of joined tables.

The goal of this PR is to be able to indicate on which table sort is applied

[radex]

Looks nice, but please either add relevant support to adapter/lokijs too, or at least, add a check that will throw an Error when attempting to construct a loki query with this feature with a useful error message

[radex]

please also add a test here: https://github.com/Nozbe/WatermelonDB/blob/master/src/__tests__/databaseTests.js#L860 that actually checks for correct behavior (not just expected query syntax). this is important for checking cross-adapter compatibility

[mlecoq]

Thanks for your feedback

[mlecoq]

Looks nice, but please either add relevant support to adapter/lokijs too, or at least, add a check that will throw an Error when attempting to construct a loki query with this feature with a useful error message

I have chosen to throw an error, sorting on joined tables doesn't look to be supported currently on loki.js

[sumansaurabh00001]

Is this still active? I am waiting for this.