Document `name` on message interaction metadata object

[advaith1]

[shaydewael]

Right now we're purposefully not documenting name and shouldn't be considered stable. if/when that changes, will follow-up.

[erkinalp]

@shaydewael why not just document as "this field is unstable"?

[yonilerner]

Ive discussed this in a few places already, but this field is for our specific UI and is subject to change as our UI changes.