docs: Add comprehensive GraphQL in Angular guide with 5 approaches

[onyedikachi-david]

Fixes #311
/claim #311

• Cover Apollo Angular, Urql, GraphQL-Request, Axios, and Fetch API
• Include detailed comparison table of approaches
• Add sections on common issues and resolutions
• Provide conclusion with recommendations for different use cases"

Working angular repo: https://github.com/onyedikachi-david/angular-graphql-multiapproach

[onyedikachi-david]

@amitksingh1490 Could you please take a look at my PR when you get a chance? Thank you.

[amitksingh1490]

@Frenzyritz13 this also needs a review please have a look once you have time

[amitksingh1490]

getting warning on your demo app

NG02801: Angular detected that `HttpClient` is not configured to use `fetch` APIs. It's strongly recommended to enable `fetch` for applications that use Server-Side Rendering for better performance and compatibility. To enable `fetch`, add the `withFetch()` to the `provideHttpClient()` call at the root of the application.

[onyedikachi-david]

getting warning on your demo app

NG02801: Angular detected that `HttpClient` is not configured to use `fetch` APIs. It's strongly recommended to enable `fetch` for applications that use Server-Side Rendering for better performance and compatibility. To enable `fetch`, add the `withFetch()` to the `provideHttpClient()` call at the root of the application.

I ignored it since it was working, just fixed it now, you may pull latest commit.

[amitksingh1490]

@onyedikachi-david Please take this feedback and update accordingly https://twitter.com/JoviDeC/status/1815101625280987264