Update `blink` and `thru` to ignore non-collidable parts

[wilyt1]

Closes #321. Implemented a raycast to move the character 1000 studs in the mouse direction, ignoring any non-collidable parts, instead of directly moving to the mouse position. Additionally, updated blink to check for the existence of HumanoidRootPart, similar to the check in thru.

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