Create GameManager with SceneManagement systems

## Description
We will need to design the visualiser aspect to be modelled after a game.

## Acceptance Criteria

- Can update and initialise
- Services and required components are loaded at start
- Gameobjects are rendering

## Implementation

> Create GameManager

- Will house the core components or any engine components.
- Services here will exist in a singleton pattern
- Will have reference to the current scene manager
- Functions here are strictly event based
- In-charge with configurating all game / visualiser aspects

> Create SceneManager

- This component will keep track of the state of the game objects
- Note: This might hold reference to a statemanager if in-game entities exist + repositories
- Holds the main start and update loop. Which will be invoked by the main.js file
- In-Charge with configurating the scene and objects