[BUG] Please include all python dependencies for defaults

[thesteve0]

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Describe the problem

When I run compute_visualizations with just the default settings it throws a dependency error. By default compute_visualizations uses the umap library to do dimension reduction, yet that library is not installed along with fiftyone.

Please either change the default method for dimensionality reduction or add the umap libary to the default packages installed along with fiftyone

Code to reproduce issue

Call compute_visualization() without specifying a method=

Willingness to contribute

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