Make Vulkan a *not required* feature (#6961)
* Make Vulkan a *not required* feature
* Add `DeviceHasVulkanSupport` helper to check this on runtime
* When trying to open a screen with a map in it, check if vulkan is supported and display a new error dialog in that case
* Fix random lint issue
* Update screenshots
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Co-authored-by: ElementBot <android@element.io>
