Feature request: Sentry Instrumentation for Dart io HttpClient.

[silverhairs]

Out of the box, when performing http request in things such as the NetworkImage widget or the CachedNetworkImagePackage flutter uses dart's io HttpClient class. Currently Sentry does not have a package to instrument that. It's easy to override the underlying HttpClient with a custom implementation by extending HttpOverrides and overriding the createHttpClient method; but we cannot pass dio and http.Client which are the two http client packages that sentry have instrumentation for. I think it would be important for sentry to support the native classes before going into the 3rd party libraries, this will reduce dependency on external library, and as a developer, I will not be obliged to depend on a 3rd party if I just want to instrument network request.

[marandaneto]

Yes, relates to #539 which is a feature request already, thanks for raising this up again, maybe we should raise the priority.
Would you like to contribute with a PR?

[silverhairs]

@marandaneto sure, I'd love to