Add WebView guide to mobile SDKs

[krystofwoldrich]

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This PR adds a new page describing how mobile SDK (RN in this case) and browser SDK should be setup for use in web views.

I added only RN for now, but when aligned on the content of this page we can copy it for all the other mobile SDKs.

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• Urgent deadline (GA date, etc.):
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[codecov]

Bundle Report

Changes will increase total bundle size by 771 bytes (0.0%) ⬆️. This is within the configured threshold ✅

Detailed changes

Bundle name	Size	Change
sentry-docs-server-cjs	10.37MB	777 bytes (0.01%) ⬆️
sentry-docs-client-array-push	9.3MB	6 bytes (-0.0%) ⬇️

[coolguyzone]

Thanks for adding this!

[philipphofmann]

Apple SDK LGTM.

[buenaflor]

Flutter looks good 👍

[stefanosiano]

Android looks good
Just a couple of questions, though.

1. Do we want to highlight the overhead of initializing the SDK in the webviews? I mean, if the user has multiple webviews in multiple parts of their app, they should know that initializing the SDK can have an overhead
2. If i understood correctly, if the user closes the webview, then the js sdk is closed and needs to be reopen in the next webview, right? If so I'd be very explicit that the user has to init the js part on every webview they have

[krystofwoldrich]

@stefanosiano

1. I thought that's implicit as we point them to a guide of how to init JS. But we can call it out. Update: JS doesn't have explicit overhead doc page. So I would not add it.

2. Good point, make sense to add.