docs(angular): add typed forms content (#6949)

src/data/roadmaps/angular/content/typed-forms@XC_K1Wahl2ySqOXoym4YU.md

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 # Typed Forms
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+Since Angular 14, reactive forms are strictly typed by default. You don't have to define extra custom types or add a ton of type annotations to your form declarations to benefit from this extra type safety, as Angular will infer types from the default value of a form control. Non-typed forms are still supported. To use them, you must import the `Untyped` symbols from `@angular/forms`.
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+Visit the following resources to learn more:
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+- [@official@Angular Official Docs - @let](https://angular.dev/api/core/@let)
+- [@article@Angular Strictly Typed Forms (Complete Guide)](https://blog.angular-university.io/angular-typed-forms/)
+- [@video@Getting started with typed reactive forms in Angular](https://www.youtube.com/watch?v=mT3UR0TdDnU)
+- [@video@Angular TYPED Forms: Are You Using Them Correctly?](https://www.youtube.com/watch?v=it2BZoIvBPc)
+- [@video@Knowing this makes Angular typed forms WAY less awkward](https://www.youtube.com/watch?v=xpRlijg6spo)