Add more coupling schemes

[johannes-moegerle]

merge after #17

[Copilot]

Pull request overview

This pull request adds support for two additional angular momentum coupling schemes (JJ and FJ) to the rydstate library, expanding beyond the existing LS coupling for alkaline earth atoms. The PR introduces new Rydberg state classes and corresponding basis classes for these coupling schemes, along with tests to verify transformations between different coupling representations.

Changes:

• Added RydbergStateSQDTAlkalineFJ and BasisSQDTAlkalineFJ classes for FJ coupling scheme
• Added BasisSQDTAlkalineJJ class for JJ coupling scheme (state class already existed)
• Refactored the nu calculation in RydbergStateSQDTAlkalineJJ to use a more concise list comprehension
• Added tests for basis transformations between LS, JJ, and FJ coupling schemes

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
src/rydstate/rydberg/rydberg_sqdt.py	Adds RydbergStateSQDTAlkalineFJ class for FJ coupling and refactors RydbergStateSQDTAlkalineJJ.nu calculation; adds AngularKetFJ import
src/rydstate/rydberg/init.py	Exports new RydbergStateSQDTAlkalineFJ class
src/rydstate/basis/basis_sqdt.py	Adds BasisSQDTAlkalineJJ and BasisSQDTAlkalineFJ classes for generating bases in JJ and FJ coupling schemes
src/rydstate/basis/init.py	Exports new BasisSQDTAlkalineJJ and BasisSQDTAlkalineFJ classes
src/rydstate/init.py	Exports new coupling scheme classes at the top level
tests/test_basis.py	Adds test coverage for transformations between LS, JJ, and FJ coupling schemes

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