Add spring animations

Merged Manuel Genovés requested to merge somas/libadwaita:spring-animations into main

This commit adds spring animations API to libadwaita. Spring animations are physically simulated, and depend on the physical properties of a spring, defined at AdwSpringParams and the velocity, original and final positions of the widget to be animated.

Fixes #34 (closed)

Edited by Alice Mikhaylenko

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