add Electra attester slashing schema

[mehdi-aouadi]

PR Description

Separate the AttesterSlashing and IndexedAttestation schemas based on the milestone: Phase0 and Electra

Fixed Issue(s)

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.

[gfukushima]

this solve an issue that I had postponed for a little later. And it does with a lot more simplicity than my approach was going for. Although this is not a very extensible approach (for future forks) I don't think we going changing this attestation related classes so soon...

[greptile-apps]

PR Summary

This pull request introduces schema separation for AttesterSlashing and IndexedAttestation based on the Ethereum 2.0 milestones Phase0 and Electra.

• Schema Updates:

  • Added AttesterSlashingElectra.json and AttesterSlashingPhase0.json in data/beaconrestapi/src/integration-test/resources/tech/pegasys/teku/beaconrestapi/beacon/schema/.
  • Removed AttesterSlashing.json to avoid redundancy.

• File Modifications:

  • Updated multiple BeaconBlockBody JSON files to reference AttesterSlashingPhase0 or AttesterSlashingElectra schemas.
  • Modified JsonTypeDefinitionBeaconRestApi.java to use schemaCache for schema definitions.

• Handler Changes:

  • Updated GetAttesterSlashings.java and PostAttesterSlashing.java to use SchemaDefinitionCache.

• Test Adjustments:

  • Updated test files to align with the new schema separation, ensuring accurate validation and comparison.

• Java Class Modifications:

  • Introduced isElectra parameter in AttesterSlashing.java and IndexedAttestation.java to dynamically set schema names based on the milestone.

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[rolfyone]

i do see this as a step down the road, but definitely in the right direction i think...
LGTM overall.