Get relative coords

[jmysliv]

Description

This pr introduces the getRelativeCoords function which enables to convert absolute coordinates to coordinates relative to the given view.

Changes

• Added getRelativeCoords function
• Updated docs

[jakub-gonet]

It doesn't convert cords - it measures and then converts cords relative to passed arguments. Can we avoid passing absolute x & y or not really?

[piaskowyk]

The current solution requires two calls of useAnimatedRef and two calls of measure. I think we can do it better. For example:
We can get the only ref to the current component, call the new version of measureWithParent - new implementation in JSI and calculate cords on the native side. What do you think?

[jmysliv]

x and y are passed to function because we can get them from gesture handler events. That is the main use case for this function to work with gesture handler.