docs(angular): add input-signals content (#6470)

src/data/roadmaps/angular/content/inputs-as-signals@LcJyAfv9hjyUNXUVyPRP4.md

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 # Inputs as Signals
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+Signal inputs allow values to be bound from parent components. Those values are exposed using a Signal and can change during the lifecycle of your component.  Angular supports two variants of inputs: `Optional` and `Required`.
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+Visit the following resources to learn more:
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+- [@official@Angular Official Docs - Inputs as Signals](https://angular.dev/guide/signals/inputs)
+- [@article@Angular Signal Inputs: Complete Guide to input()](https://blog.angular-university.io/angular-signal-inputs/)
+- [@video@Angular's New Signal Inputs](https://www.youtube.com/watch?v=yjCeaiWXC0U)