Introduce RetryDelegate

[martinbonnin]

See #5862 (comment)

In addition to the new API, this:

• stabilizes the retry API. It's been around for more than 1 year now. Might as well consider it stable. I'm still not 100% certain we reached the end of the road. There are a lot of heuristics down there and finding the good default that is also flexible is not easy but for the sake of moving forward, let's commit to this and go through deprecation cycles if we ever need to change.
• embraces the subscription vs query differences. I think most subscriptions want to be retried when it's not always the case for queries. The default retry behaviour is now to retry forever for subscriptions and give up after 7 seconds for queries.

[apollo-librarian]

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* (developer-tools)/kotlin/v5/advanced/network-connectivity.mdx

Build ID: c66ffb3af42adffc92e7a920
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URL: https://www.apollographql.com/docs/deploy-preview/c66ffb3af42adffc92e7a920

[BoD]

IIRC OfflineApolloException (which is a ApolloNetworkException) should be excluded here, otherwise we retry when we should fail fast if offline

[martinbonnin]

Makes sense. I'll do something about it 👍

[martinbonnin]

Alright so I changed everything 😅 . Initial description updated.