Wrap models from NVIDIA Modulus.

[samuelburbulla]

Feature: Wrap models from NVIDIA Modulus.

Description

Which issue does this PR tackle?

• Fixes #127

How does it solve the problem?

• Implements continuiti.wrapper.modulus submodule including FNO class.

How are the changes tested?

• Added test_modulus_fno.

TODO

• [ ] Testing with nvidia-modulus in CI?

Checklist for Contributors

• [x] Scope: This PR tackles exactly one problem.
• [x] Conventions: The branch follows the feature/title-slug convention.
• [x] Conventions: The PR title follows the Bugfix: Title convention.
• [x] Coding style: The code passes all pre-commit hooks.
• [ ] Documentation: All changes are well-documented.
• [ ] Tests: New features are tested and all tests pass successfully.
• [ ] Changelog: Updated CHANGELOG.md for new features or breaking changes.
• [ ] Review: A suitable reviewer has been assigned.

Checklist for Reviewers:

• [ ] The PR solves the issue it claims to solve and only this one.
• [ ] Changes are tested sufficiently and all tests pass.
• [ ] Documentation is complete and well-written.
• [ ] Changelog has been updated, if necessary.