add createTexture function with bitmap input

[artrointel]

https://github.com/artrointel/CanvasOverGLES/blob/main/app/src/main/java/com/artrointel/canvasovergles/glview/renderers/gl/GLTexture.java#L29
static generateTexture like

    Bitmap target = bitmap;

    // bitmap should be vertically flipped in the GL space
    if (flipY) {
        Matrix xForm = new Matrix();
        xForm.setScale(1, -1);
        target = Bitmap.createBitmap(bitmap, 0, 0, bitmap.getWidth(), bitmap.getHeight(), xForm, false);
        bitmap.recycle();
    }

    GLES20.glBindTexture(GL_TEXTURE_2D, texture.mId);
    GLUtils.texImage2D(GLES20.GL_TEXTURE_2D, 0, target, 0);

    target.recycle();