FEAT add sortByField and remove mysql specific code from DataList

[lekoala]

Description

This is an alternative proposal to #11509

This is based on the work of @LennyObez with some improvements (avoid hardcoded 999, don't escape integer)

Manual testing steps

Create and populate two DataObjects that have a many_many relation between them
Perform an eagerLoad on DataObject::get() and convert the result to an array
Observe that the new sortByField method is used

Issues

#11503

Pull request checklist

• The target branch is correct
  • See picking the right version
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• This change is covered with tests (or tests aren't necessary for this change)
• Any relevant User Help/Developer documentation is updated; for impactful changes, information is added to the changelog for the intended release
• CI is green

[GuySartorelli]

Looks great at a glance, thanks!
Can you please update the commit message to use the correct prefix (probably NEW) as per the commit message guidelines? It might also be appropriate to add Lenny as a co-author if you'd like to.

I'll review this properly on Monday.

[GuySartorelli]

Looks great, thank you for this. Works as expected locally with MySQL (which makes sense - the query is identical in that case). Looks like it should work with other database providers as well.

I'll fix up the commit message things I noted above on merge.