[Feat]: ActionMenu/Picker - add identifier to internal sp-menu for css customization

[spdev3000]

Code of conduct

• I agree to follow this project's code of conduct.

Impacted component(s)

ActionMenu, Picker

Description of the requested feature

We have seen quite difficulties to adapt and style underlying sp-menu without any additional id or class of that element. The problem is - if you’d add css styles for an sp-menu of an ActionMenu and the user opens another (not-styled) ActionMenu, those sp-menu css styles will get also applied to the new menu, as there is a short time, when both menus are both opened.
Would it be possible to add an optional parameter (data-menu-id or menuClass) to the newly created internal sp-menu in PickerBase to be used for styling or for e2e tests as css reference?

Styling use cases could include:

• subtitles / subtext in an sp-menu-item
• different colors
• extended alignment of icons for multiline items

Mockups or screenshots

No response

Implementation notes or ideas

No response

[Westbrook]

Leaking these implementation details could be prevented by moving to a <dialog>/[popup] structured API.

[najikahalsema]

Will be addressed by #2086