Pluggable Health Checks

[jevinjojo]

PR description

Refactors Besu’s health check system to use the plugin framework, making liveness and readiness checks fully pluggable

• Added health check interfaces to plugin-api
• Created plugin implementations for liveness and readiness checks
• Updated main app and plugins to use shared interfaces

Fixed Issue

• #7704

Thanks for sending a pull request! Have you done the following?

• [x] Checked out our contribution guidelines?
• [x] Considered documentation and added the doc-change-required label to this PR if updates are required.
• [x] Considered the changelog and included an update if required.
• [x] For database changes (e.g. KeyValueSegmentIdentifier) considered compatibility and performed forwards and backwards compatibility tests

Locally, you can run these tests to catch failures early:

• [x] spotless: ./gradlew spotlessApply
• [x] unit tests: ./gradlew build
• [x] acceptance tests: ./gradlew acceptanceTest
• [x] integration tests: ./gradlew integrationTest
• [x] reference tests: ./gradlew ethereum:referenceTests:referenceTests