[Engine] [Core] [SDL] Manage user inputs

[Niwils]

Be able to map the keyboard keys with the player's configuration.
Define keyboard-driven actions.
Map key strokes to core actions or model updates.

[Niwils]

22nd of June, 2024: Basic keys and mouse events are supported, and skeleton for actions handling from the OS to the display objects is properly implemented. There is not yet any capability to allow the player to rebind the action keys.