Upgdate to latest Apollo server / subscriptions

[code4bones]

• upgrade to Apollo server v3 ( + switch from subscriptions-transport-ws to graphql-ws )
• add Custom PubSub creator ( for use custom PubSubEngine )
• add Update/Reload schema without restarting server/ws
• Playground ( RenderPageOptions ) options in serverOptions.playgroundOptions
• add serverOptions.subscriptions.onConnect should return acts lile graphql-ws
• add serverOptions.subscriptions.context should return user account ( like "authenticate" method )
• CAUTION: with new graphql-ws subscriptions are not available in build-in playground
• WARNING: graphql-upload disabled ( new versions is mjs type )
• Not tested - DataLoader
• Example in examples/full/

[intech]

Hello! Thanks for your contribution. There are a few quick fixes but important ones:

1. Look at the diff between the example files. There are a lot of changes that don't make sense for this PR.
2. You cannot change the description and repository in package.json.
3. A lot of commented code. If it is not needed, remove it.

[veeramarni]

how soon this can be merged? Apollo server v2 is very outdated, and it needs to be in v3 atleast.

[icebob]

CI is failed

[intech]

Judging by the CI error, dependency packages like graphql-subscriptions and possibly others should be updated so that there is no conflict between new and old packages in peer dependencies.

[abdavid]

How is this coming along? Is there anything I can do to help?

[AndreMaz]

How is this coming along? Is there anything I can do to help?

Fixing broken tests would help a lot