Solution for lazy importing/ handling ImportErrors

[blythed]

In order to make this type of thing work:

pip install superduperdb[all]
pip install superduperdb[torch]
pip install superduperdb[sklearn,pillow]

We would probably need some kind of lazy import scheme.

[blythed]

In superduperdb.models.wrapper.wrap_model make sure that we get graceful error handling if package isn't installed or something like that.

[blythed]

Ideally would like:

pip install superduperdb[all]
pip install superduperdb[torch]
pip install superduperdb[sklearn,pillow]
...