defaultOwnTheme  
  fun defaultOwnTheme(isInDarkMode: Boolean = isSystemInDarkTheme(), typography: StreamTypography = StreamTypography.defaultTypography(), shapes: StreamShapes = StreamShapes.defaultShapes(), colors: StreamColors = when (isInDarkMode) {
                true -> StreamColors.defaultDarkColors()
                else -> StreamColors.defaultColors()
            }): MessageTheme
Builds the default message theme for the current user's messages.
Return
A MessageTheme instance holding our default theming.