Add plot method and data.py to Esri2020 dataset

[nilsleh]

Since RasterDatasets should have their own plot method per #253, this PR adds a plot method and a data.py file to the Esri2020 dataset.

[calebrob6]

Looks like this is missing data.py

[adamjstewart]

I don't actually see a data.py file in this PR.

[adamjstewart]

I'm running the test_esri2020.py tests on main (still need to try this PR branch) and they are incredibly slow for some reason.

[adamjstewart]

Tests are much faster now with this branch, awesome.

When I run the tests, I'm seeing a leftover file that was not tracked by git. I'm assuming you meant to add this to git? I did so in the last commit.

[adamjstewart]

Tests are missing coverage of the following lines:

[nilsleh]

When I run the tests, I'm seeing a leftover file that was not tracked by git. I'm assuming you meant to add this to git? I did so in the last commit.

I thought, that it was desirable to push as few data files as possible and to keep it minimal with just the zipped data.

[adamjstewart]

I thought, that it was desirable to push as few data files as possible and to keep it minimal with just the zipped data.

It is, and if you properly copy all zip files to tmp_path before extraction then you shouldn't end up with any new files in the git repo. But since the file is being extracted locally, it ends up creating a new untracked file.