Support dynamic create/update of entities using gaussian_splatting

[arvind-iyer]

If I create and insert an element into the DOM using the gaussian_splatting component during run-time rather than at the beginning, it is not loaded into the scene since it only runs loadData(...) on page load.

Likewise, if I update the src attribute of an existing element, it will not immediately update the scene with the new splat, that needs loadData to be run manually somehow

[Kevin-Miao]

+1. Just curious if you have been able to find any workarounds.