Lifecycles for Prvd 'M Wrong

Implements a "small" amount of lifecycle events for providers.

We'll admit. We've gotten a bit too lifecycle happy:

• :onPostSimulation(dt: number) runs every RunService.PostSimulation
• :onPreSimulation(dt: number) runs every RunService.PreSimulation
• :onPreRender(dt: number) runs every RunService.PreRender
• :onPlayerAdded(player: Player) runs every Player.PlayerAdded
• :onPlayerLeaving(player: Player) runs every Player.PlayerLeaving
• :onShutdown() binds to game:BindToClose for games and plugin.Unloading for plugins

This package is part of Prvd 'M Wrong.