docs(angular): add interceptors content (#6527)

src/data/roadmaps/angular/content/writing-interceptors@xG7iSVOGcbxJbNv3xbNfc.md

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 # Writing Interceptors
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+Interceptors are middleware that allows common patterns around retrying, caching, logging, and authentication to be abstracted away from individual requests.
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+Visit the following resources to learn more:
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+- [@official@Angular Official Docs - Interceptors](https://angular.dev/guide/http/interceptors)
+- [@article@Angular Interceptor](https://www.scaler.com/topics/angular/angular-interceptor/)
+- [@video@Interceptors in Angular](https://www.youtube.com/watch?v=w1_AmHv2LmA)