(server) Click to Expand in Multiple Selector
(server) Click to Expand in Multiple Selector

Summary:
per title

Changelog: Add multiple selector to layout inspector to allow user to select components at a position

Reviewed By: mweststrate

Differential Revision: D21214898

fbshipit-source-id: 7b52d9d3c93e7ec0d28124a3a675ccfdd014c54d

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