refactor: remove Tables.jl impl, fall back to RecursiveArrayTools

[AayushSabharwal]

Close #798

Checklist

• Appropriate tests were added
• Any code changes were done in a way that does not break public API
• All documentation related to code changes were updated
• The new code follows the
  contributor guidelines, in particular the SciML Style Guide and
  COLPRAC.
• Any new documentation only uses public API

Additional context

Add any other context about the problem here.

[AayushSabharwal]

I think the isrowtable tests should have been removed with RAT@3, since the relevant documentation says:

Requirements for defining isrowtable include:

• Tables.rows(x) === x, i.e. the table object itself is a Row iterator
• If the table object is mutable, it should support:
  • push!(x, row): allow pushing a single row onto table
  • append!(x, rows): allow appending set of rows onto table
• If table object is mutable and indexable, it should support:
  • x[i] = row: allow replacing of a row with another row by index

The third point is not valid for AbstractDiffEqArray

[ChrisRackauckas]

good point

[ChrisRackauckas]

There's no PR to RecursiveArrayTools though?

[AayushSabharwal]

It already has the interface, and doesn't define isrowtable

[AayushSabharwal]

In fact the code I removed here is almost identical to that in RAT