[Epic] Improve state / component API

[speigg]

State - engine state Component - ecs data

getState(StateDefinition) — efficiently get state data, typed as readonly getMutableState(StateDefinition) — get mutable state that granularly tracks changes useState(StateDefinition, optionalKeyPath) — use state inside a reactive context

getComponent(entity, Component) — efficiently get component data, typed as readonly getMutableComponent(entity, Component) => get mutable component data that granularly tracks changes useComponent(entity, Component) => use ECS data inside a reactive context

[HexaField]

I propose also the API style for this is ECS.getComponent