ENH(`mne.Report`): add `section` parameters to `.add_raw`, `.add_epochs` and `.add_evoked`

Describe the new feature or enhancement

Hi! Thanks for the amazing work on MNE-Python :)

I'm wondering if there's any reason the .add_raw, .add_epochs and .add_evoked methods of mne.Report don't support the section parameter supported by many other methods in the same class.

If there's no design reason why this option is omitted, would you accept a PR to add this parameter in all these places?

Thanks!

Describe your proposed implementation

Add the section parameter to the .add_raw, .add_epochs and .add_evoked methods of mne.Report (and potentially others that lack it?)

Describe possible alternatives

This would be a useful change because I want to group my report sections by run, and right now it's not possible (let me know if there's a workaround though!)

I guess the alternative is leaving the current methods as they are, but I'm not sure if there's any principled reason why they shouldn't be grouped into sections.

Additional context

No response

Start by locating the mne.Report.add_raw, add_epochs, and add_evoked implementations and compare how other Report methods accept section. Check the existing Report tests for these methods and add coverage showing that section groups the resulting report entries; done means all three methods accept and honor the parameter consistently.