Send pin-drop location (#1179)

* add location sharing action in room, and open location sharing screen

* add pin location sharing

* fix asset, add tests for location viewModel, add send location request

* fix map zoom level, fix assets for location

* add feature flag for location sharing

* hide attribution button

ElementX/Resources/Assets.xcassets/Images/Location/Contents.json

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+      "idiom" : "universal"
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+    {
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