chore: also export DevToolbarApp type for API

[alexanderniebuhr]

Changes

• If you write your own Dev Toolbar App and want to type it, you need exported types.
• Before it was interface DevOverlayPlugin
• I kept the existing one, but added a copy as interface DevToolbarApp
• I would probably like to export the same interface as two names, but I'm not sure how to do it with typescript

Testing

• manually tested

Docs

• not needed for the change, but I wonder if we should have an typed example in the Dev Toolbar App API reference page

cc @sarah11918

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[natemoo-re]

You can alias the existing types with the method I commented here!

I think the best thing to do would be to rename the existing types to match the new "Toolbar" name and then add exported aliases for the old names. Does that make sense?

[natemoo-re]

Thanks!