Initial quick support for pydantic 2 (>=1.10.17)

[ijpulidos]

Changing the try-error imports and just using pydantic.v1 API point for now. This should be supporting pydantic>=1.10.17 as per the migration guide in https://docs.pydantic.dev/latest/migration/#continue-using-pydantic-v1-features

Solves #14

[ijpulidos]

pydantic 2 seems to be picked up when creating the environment https://github.com/choderalab/feflow/actions/runs/10258575412/job/28381617669?pr=58#step:6:409

This seems to be working fine, ready for review.

[mattwthompson]

You might consider, if you don't mind the larger matrix, testing both v1 and v2 at install time, just to catch when one doesn't work. Right now it looks like either should work at install time

[ijpulidos]

@mattwthompson that's a good suggestion. Thanks!

[ijpulidos]

Should be working correctly:

• pydantic 1: https://github.com/choderalab/feflow/actions/runs/10290852560/job/28481794543?pr=58#step:6:408
• pydantic 2: https://github.com/choderalab/feflow/actions/runs/10290852560/job/28481795076?pr=58#step:6:411