fix!: remove --region-file option and update to poetry 2 in our CI

[aryarm]

This PR proposes merging the --region and --region-file options of the complexity command to make the behavior consistent with the examples in the docs for the complexity command -- specifically, this example:

panct complexity \
  --region regions.bed --out test.tab \
  --metrics sequniq-normwalk,sequniq-normnode \
  hprc-v1.1-mc-grch38.gbz

(We automatically detect whether the input is a single region or a path to a BED file of regions.)

This PR also migrates our CI to poetry 2 like in gymrek-lab/TRTools#249 and it adds some directions for users who might need to install gbz-base. Finally, it bumps our minimum python version to 3.10 so that we can use the newest type-hinting features. But if we would prefer to keep support for 3.9 (which is technically still not end-of-life at least until the end of the 2025), I can easily revert the changes.

TODO:

• add tests for BED file input. I don't think there are any as of yet?
  • fix xfail in the new tests

[aryarm]

Update: I just finished adding tests and some other docs. This is now ready for you to take a look, @aarushi03! 🎉