Yarrowformat

What's Changed
* Fix Pydantic v2.0 Issue by FrsECM in https://github.com/michelin/YarrowFormat/pull/27
* fix issues with pydantic v2 update by mathieupichon-bib in https://github.com/michelin/YarrowFormat/pull/28
* Python version 3.6 is no [longer supported](https://devguide.python.org/versions/) and other versions bumps should follow

New Contributors
* FrsECM made their first contribution in https://github.com/michelin/YarrowFormat/pull/27

**Full Changelog**: https://github.com/michelin/YarrowFormat/compare/v1.2.1...v2.0.0

Added the following features :

- splits handling in the `Image` and `MultilayerImage` classes, see the documentation [reference](https://yarrowformat.readthedocs.io/en/latest/_autosummary/yarrow.yarrow_cls.YarrowDataset.html#yarrow.yarrow_cls.YarrowDataset.get_split)
- merging multiple `YarrowDataset` objects, see the documentation [here](https://yarrowformat.readthedocs.io/en/latest/append.html)
- added a `meta` property to the `Annotation` class to let any arbitrary data be inserted