Fix AppOption types

[slimbuck]

This PR updates AppOption types to class constructors (instead of class instances), which appears to appease typescript.

VSCode shows errors on these now, not sure how to fix that.

[mvaligursky]

I tried few variations of these (not this one yet), and something always does not work.

[slimbuck]

With the latest update playcanvas.d.ts looks as follows:

    lightmapper: any;
    /**
     * The BatchManager.
     *
     * @type {typeof BatchManager}
     */
    batchManager: any;
    /**
     * The XrManager.
     *
     * @type {typeof XrManager}
     */
    xr: any;
    /**
     * The component systems the app requires.
     *
     * @type {(typeof ComponentSystem)[]}
     */
    componentSystems: (typeof ComponentSystem)[];
    /**
     * The resource handlers the app requires.
     *
     * @type {(typeof ResourceHandler)[]}
     */
    resourceHandlers: (typeof ResourceHandler)[];

[slimbuck]

resource handler is being recast as an interface in types-fixup.js:

dts = dts.replace('export class ResourceHandler', 'export interface ResourceHandler');

@willeastcott any idea why this is done?

[mvaligursky]

also, try to build API docs from jsdocs locally, I think I had issues with this in the past as well.

[willeastcott]

Yep, I have a feeling the docs build process fails on those typeof keywords, IIRC.

[slimbuck]

The latest version (with constructor syntax) seems to work fine when compiling typescript and also generates docs.

CI fails though.

[mvaligursky]

related https://github.com/playcanvas/engine/pull/4324