Description

This PR aims to include functionality that allows modifying gravity in the x-axis and y-axis explicitly.

Checklist

[X] The title of my PR starts with a Conventional Commit prefix (fix:, feat:, docs: etc).
[X] I have read the Contributor Guide and followed the process outlined for submitting PRs.
[X] I have updated/added tests for ALL new/updated/fixed functionality.
[X] I have updated/added relevant documentation in docs and added dartdoc comments with ///.
[ ] I have updated/added relevant examples in examples.