Remove vertx dependency

[lucassaldanha]

PR Description

We don't need it... I think... :)

Fixed Issue(s)

N/A

Documentation

• I thought about documentation and added the doc-change-required label to this PR if updates are required.

Changelog

• I thought about adding a changelog entry, and added one if I deemed necessary.

---

Note

Removes Vert.x (and Reactor) from builds and code, updates license/versions configs, and simplifies node shutdown.

• Dependencies:
  • Remove io.vertx:* from infrastructure/metrics, teku, and gradle/versions.gradle.
  • Remove io.projectreactor:reactor-core from networking/p2p and gradle/versions.gradle.
• Core:
  • In tech.pegasys.teku.AbstractNode, remove Vert.x usage (field, import) and the shutdown call thenRun(vertx::close).
• Build/Config:
  • Drop -Dvertx.disableFileCPResolving=true from applicationDefaultJvmArgs in build.gradle.
  • Remove io.vertx from gradle/license-report-config/allowed-licenses.json.

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[StefanBratanov]

I agree we don't need it I am fairly sure.