feat(schema): Add view_names to AppContext

[denrase]

Adds the view_names property to AppContext, so clients can send which screen (or multiple screens) are visible to the user during an event.

Relates to getsentry/sentry-dart#1545

[marandaneto]

@denrase you can mark it as ready for review, maybe just the snapshots need to be fixed.

[marandaneto]

@jjbayer @alek-sentry would you be able to review this for us? thanks.

[olksdr]

LGTM

you might want to add changelog entry in Unreleased section about the change or just skip the changelog altogether

[iker-barriocanal]

LGTM!

As a side note, we use a specific commit message format at Sentry, defined here. Could we update the PR description?

[denrase]

@iker-barriocanal Updated the title and description. Guess these should be used in the (squash) commit message when merging the issue? Is this what you had in mind? Thank you!

[iker-barriocanal]

@denrase yep, thanks for updating! Feel free to go ahead and merge

[denrase]

@iker-barriocanal I merged in the current main, could you be so kind and approve the workflows? ty 🙇

[denrase]

@iker-barriocanal Ok, think everything is in place and we can merge? Would you be so kind, as I don't have the permission on this repo. :)