Update unyt_arrayConverter to handle sequences of unyt types.

[l-johnston]

No description provided.

[ngoldbaum]

Maybe it would also be useful to define a __call__ implementation that just unconditionally adds the converters to the registry so that people can turn it on like this:

import unyt
unyt.matplotlib_support()

And thereafter not need to use the context manager. Here I’m using my suggested name for MPLUnitsCM just to illustrate that it’s a little more convenient to not use a camel cased name.

Thank you so much for working on this so quickly and being so ready to help out. I’m very appreciative of the time and effort you are putting into this.

[ngoldbaum]

There were some finicky documentation formatting issues I fixed in the last commit I just pushed. As soon as the tests pass I'm going to merge this. Thank you again for spending your time today on this.