`max_b` attribute not used

[jhlegarreta]

What would you like to see added in this software?

The max_b attribute is not being used by current dMRI models. It should either be removed or its implementation finished or demonstrated by a mock test.

nifreeze/src/nifreeze/model/dmri.py

Line 58 in e92e725

"_max_b": "The maximum b-value supported by the model",

Do you have any interest in helping implement the feature?

Yes

Additional information / screenshots

Same as a max b-value, some may argue that some models do not work well under a given b-value. Unless this is done internally by the third-party DIPY models, it may be needed n NiFreeze. The idea of a minimum/maximum b-value is similar to the start frame for PET sequences in issue #22.