Allow to keep Texture2D as read-write enabled

[der-hugo]

See https://stackoverflow.com/questions/75050788/how-to-create-webp-image-file-from-url-in-unity/75056837#75056837

In CreateTexture2DFromWebP you are using

lTexture2D.Apply(lMipmaps, true);

which prevents later read/write on that texture.

You could have a parameter

public static unsafe Texture2D CreateTexture2DFromWebP(byte[] lData, bool lMipmaps, bool lLinear, out Error lError, bool isReadWriteEnabled = false, ScalingFunction scalingFunction = null )

and then use

lTexture2D.Apply(lMipmaps, !isReadWriteEnabled);

so users can still keep it enabled if they want/need to.