add forcedExtension to ITextureCreationOptions

[noname0310]

The forcedExtension option seems to be missing from ITextureCreationOptions.

Currently I am using the ITextureCreationOptions to create the texture:

const tex = new Texture(
    "url...",
    scene,
    {
        noMipmap: true,
        invertY: false,
        samplingMode: Texture.NEAREST_SAMPLINGMODE,
        onLoad: (): void => {
            // do something
        }
    }
);

But in order to use forcedExtension here, the code should look like this:

const tex = new Texture(
    "url...",
    scene,
    {
        noMipmap: true,
        invertY: false,
        samplingMode: Texture.NEAREST_SAMPLINGMODE,
        onLoad: (): void => {
            // do something
        }
    },
    undefined, // invertY
    undefined, // samplingMode
    undefined, // onLoad
    undefined, // onError
    undefined, // buffer
    undefined, // deleteBuffer
    undefined, // format
    undefined, // mimeType
    undefined, // loaderOptions
    undefined, // creationFlags
    ".bmp" // forcedExtension
);

I guess this is not the intended design. That's why this change is proposed.

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