feat(subscription): mutex free subscription implementation

[StarpTech]

Motivation and Context

This PR bumps the engine with the subscription handling refactor wundergraph/graphql-go-tools#1076

It exposes the subscription_fetch_timeout property to configure the maximum time a subscription fetch can take before it is considered timed out.

Checklist

• I have discussed my proposed changes in an issue and have received approval to proceed.
• I have followed the coding standards of the project.
• Tests or benchmarks have been added or updated.
• Documentation has been updated on https://github.com/wundergraph/cosmo-docs.
• I have read the Contributors Guide.

[github-actions]

Router image scan passed

✅ No security vulnerabilities found in image:

ghcr.io/wundergraph/cosmo/router:sha-79e8b24950c471621b00561d8a8ecf78da4064ee