Design and Extract LayoutService

[mumiao]

Resolved #173

export interface ILayoutService extends Component{    
    setMenuBarHidden(): void;
    setSideBarHidden(): void;
    setPanelHidden(): void; 
    setActivityBarHidden(): void; 
    setStatusBarHidden(): void;   
    setPaneSize(splitPanePos: string[]): void;  
    setHorizontalPaneSize(horizontalSplitPanePos: string[]): void; 
    togglePanelMaximized(): void;   
    isPanelMaximized(): boolean | undefined;
    getContainer(domId: string): HTMLElement 
    setSideBarPosition(position: Position): void;
    getSideBarPosition(): Position;
    conatiner: HTMLElement | null;
}

[wewoor]

layoutService container 的初始化，必须要再 MoleculeProvide DidMount 中去执行，ID_APP 目前是指Workbench View， 这个会存在实例化 layoutService 的时候，container 始终是 body 元素的问题