feat: subscriptions overhaul

[endigma]

@coderabbitai summary

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.

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[github-actions]

❌ Internal Query Planner CI checks failed

The Internal Query Planner CI checks failed in the celestial repository, and this is going to stop the merge of this PR.
If you are part of the WunderGraph organization, you can see the PR with more details.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 60.80%. Comparing base (e67bc73) to head (a15b9b5).

Additional details and impacted files

@@                        Coverage Diff                         @@
##           feat/improve-memory-management    #2486      +/-   ##
==================================================================
+ Coverage                           60.46%   60.80%   +0.33%     
==================================================================
  Files                                 229      229              
  Lines                               23893    23836      -57     
==================================================================
+ Hits                                14448    14494      +46     
+ Misses                               8171     8083      -88     
+ Partials                             1274     1259      -15     

Files with missing lines	Coverage Δ
router/core/errors.go	71.08% <100.00%> (ø)
router/core/factoryresolver.go	78.64% <100.00%> (+1.67%)	⬆️
router/core/graphql_handler.go	71.53% <100.00%> (ø)
router/core/plan_generator.go	75.00% <ø> (+10.59%)	⬆️
router/core/trace_dialer.go	58.97% <ø> (-7.70%)	⬇️
router/core/websocket.go	77.03% <ø> (+1.22%)	⬆️

... and 10 files with indirect coverage changes

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