Allow uniform refinements when using a pre-split mesh

[fdkong]

Reason

A uniform refinement is helpful for some instances when using a pre-split mesh.
For example, a 'coarse' mesh might completely resolve geometry (also is large)
but does not have enough resolution for the interior. For this scenario,
we pre-split the coarse mesh (since it is large), and load the pre-split mesh in parallel,
and then do a few levels of uniform refinements to have a fine mesh that
potentially resolves physics features of the interior.

Design

Add an optional parameter to control whether or not allow uniform refinements when using a pre-split mesh.

Impact

Enable large-scale simulations