"current key" for animation

[AhmedTheCodeWiz]

basicley when your making an animation for example making a node move to the right, you need to have a set position starting key so lets say (y: 0, x:0) and the animation has a second key that is the end position, (y:0, x 10) this moves the node to the right by 10 units, but if lets say the actual node is at (y: 35, x:90) the start key will just teleport to the 0,0 coordinate, and then play the slide right animation, instead godot should have a key that takes in the current position, scale, size, etc.. and then goes to the set position key, this allows from more dynamic animations and a smoother experience for developers