[FEATURE] Add FastNavPlugin.defaultScaleCanvasResolutionFactor

[xeolabs]

This PR extends FastNavPlugin with a new option, defaultScaleCanvasResolutionFactor, which sets the factor to which we restore the canvas resolution scale when we stop interacting with the viewer.

This allows us to use canvas resolution scaling for anti aliasing when we're not in fast navigation mode.

Usage

• Run example

    const fastNavPlugin = new FastNavPlugin(viewer, {
        hideEdges: true,
        hideSAO: true,
        hideColorTexture: true,
        hidePBR: true,
        hideTransparentObjects: false,
        scaleCanvasResolution: true,
        defaultScaleCanvasResolutionFactor: 0.5,
        scaleCanvasResolutionFactor: 0.25,
        delayBeforeRestore: true,
        delayBeforeRestoreSeconds: 0.4
    });