Trainers: add Instance Segmentation Task

[ariannasole23]

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[adamjstewart]

Looks good, just need to make the code and tests match our existing trainers and run ruff: https://torchgeo.readthedocs.io/en/latest/user/contributing.html#linters

[adamjstewart]

To solve the import issue, you also need to add 2 lines to torchgeo/trainers/__init__.py, just copy the style used by other classes.

[adamjstewart]

Can you run ruff on the code to make it more uniform? This will make it easier to review.

[adamjstewart]

Note that #1978 was just merged, which changes some of the VHR-10 dict keys and values to be more conformant with Kornia. We should probably rebase/merge this PR to make sure it works with these new changes.

[adamjstewart]

TODO: figure out how to handle multispectral inputs, will need to change input layer for 3+ bands.