Add a meta attribute to the TimingModel

[JPGlaser]

Hey All,

Currently, pint_pal is pinned at version 1.0.1 because we have a few places where we store metadata about the TimingModel object as direct attributes. This is no longer valid in version 1.1. As discussed on the 12/12 telecon, a quick fix would be to make a new meta attribute which is a dictionary. This would allow users to add metadata to the TimingModel without directly affecting the model itself in possibly weird ways.

See Tests found here:
https://github.com/nanograv/pint_pal/actions/runs/12300670688/job/34329402278?pr=94

~ Joe G.

[paulray]

Yeah the CHANGELOG for 1.0.2 has this, which must be the cause:

• Doing model.par = something will try to assign to par.quantity or par.value but will give warning

[abhisrkckl]

Added in #1874