fix(Text): Add separate layout thread with dispatcher access #542
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Text measurement was a bit of a performance bottleneck due to context switching from the native module thread to the dispatcher thread.
Eventually, we may want to implement text measurement that does not invole cloning the RichTextBox (e.g., using DWrite APIs or Win2D), but this is progress for now.
We create the layout thread from a static secondary CoreApplicationView with a Window that is never activated.