Removed usage of Enum in MArrayElementComp in favor of getters and setters

[AidanMDev1]

Motivation and Explanation: Why and how do your changes improve the library?

Adjusted MArrayElementComp to use getters and setters instead of Enum to better conform with Manim practices.

Reviewer Checklist

• [ ] The PR title is descriptive enough for the changelog, and the PR is labeled correctly
• [ ] If applicable: newly added code segments are adequately covered by tests
• [ ] If applicable: newly added non-private functions and classes have a docstring including a short summary and a PARAMETERS section