feat: support graphql subscriptions

[kettanaito]

• Closes feat: support GraphQL subscriptions #2357

Roadmap

• Implement the graphql.subscription() API.
• Fix the missing handler duduplication issue in HandlersController.
• Ensure that graphql.operation() also captures subscriptions.
• Add browser tests.
• Add type tests.
• Bug: Multiple connection events fire for a single subscription. Must have to do with the transport layering.

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[socket-security]

Review the following changes in direct dependencies. Learn more about Socket for GitHub.

Diff	Package	Supply Chain Security	Vulnerability	Quality	Maintenance	License
	graphql-ws@​5.16.2
	graphql-yoga@​5.21.2

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commit: caaba29