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.