Component decorators (#354)

Add decorator variants for decorator components

Add the "pipe" operator for components, similar to what was done for Elements.
We are able to put something like:
```
Button(...) | Maybe(&show_button)
```

Add decorators for:
- `Maybe`
- `CatchEvent`
- `Renderer`

Signed-off-by: Kefu Chai <tchaikov@gmail.com>
Co-authored-by: ArthurSonzogni <sonzogniarthur@gmail.com>

examples/component/print_key_press.cpp

@@ -84,7 +84,7 @@ int main(int argc, const char* argv[]) {
     return window(text("keys"), vbox(std::move(children)));
   });
 
-  component = CatchEvent(component, [&](Event event) {
+  component |= CatchEvent([&](Event event) {
     keys.push_back(event);
     return true;
   });