update function list in init

[JessicaS11]

When working on #424, I noticed a few of the newer api functions weren't being imported because they hadn't been added to the list in __init__.py. I update the list and added comments of which modules they're from for clarity. I'm wondering what the incentive for lines 5-17 is (versus from .api import *, with the acknowledgement that *isn't best practice - so perhaps there's a better solution) so two manual lists of the functions in .api don't need to be maintained.

This work is currently included in #424, but I figured separating it out would be clearer.

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📚 Documentation preview 📚: https://earthaccess--461.org.readthedocs.build/en/461/

[chuckwondo]

@JessicaS11, do you have time to address @jhkennedy's comments so we can approve and merge your contribution?

[JessicaS11]

@chuckwondo Thanks for the ping - it looks like my updates and your message crossed paths. This should be all set. I also just checked against the current api.py and the list still looks complete.