[10.x] Make default ID column configurable in Query\Builder::find forPageBeforeId and forPageAfterId

[GromNaN]

The protected method Illuminate\Database\Query\Builder::defaultKeyName() is already used in Illuminate\Database\Concerns\BuildsQueries::chunkById() and Illuminate\Database\Concerns\BuildsQueries::orderedLazyById(). It was introduced by #28065.

This is necessary to avoid overloading this methods only to change the default value of the $column argument.
Example: MongoDB uses _id by default. We have to redefine the methods.

[taylorotwell]

I really don't think trying to shoehorn the relational query builder into a MongoDB supporting query builder is a good idea. 😬

[GromNaN]

What’s the point of Illuminate\Database\Query\Builder::defaultKeyName() if you don’t use it where the default key name is expected?