Support option category merging

[nathanwinder]

interface DebugOptions {
  log: LogDebugOptions;
  other: OtherDebugOptions;
}
const DebugContext = createDebugContext<DebugOptions>(true);
const DebuggableOther = withDebugProps(Other, DebutContext, "log", "other");

This would result in both the properties from log options and other options being applied to the component. This would be helpful in cases like logging where I want to option to apply across multiple components.