Add GetAttesterSlashingV2

[gfukushima]

PR Description

This PR introduces the skeleton of the new method GetAttesterSlashingV2. Note though that as of now this differ minimally from the V1 as Teku currently doesn't not make a distinction of Electra.IndexedAttestation and Phase0.IndexedAttestation since the only difference is the size limit of the attesting_indices array.
This implementation does not make us 100% complaint with the spec but should result in the right json result after all.

Fixed Issue(s)

Part of

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.

[greptile-apps]

PR Summary

Introduced the GetAttesterSlashingV2 method to the Beacon REST API, adding a new endpoint and associated schema for retrieving attester slashings with future-proofing for different attesting_indices array sizes.

• Added data/beaconrestapi/src/integration-test/resources/tech/pegasys/teku/beaconrestapi/beacon/paths/_eth_v2_beacon_pool_attester_slashings.json for new endpoint definition.
• Added data/beaconrestapi/src/integration-test/resources/tech/pegasys/teku/beaconrestapi/beacon/schema/GetPoolAttesterSlashingsV2Response.json to define response schema.
• Modified data/beaconrestapi/src/main/java/tech/pegasys/teku/beaconrestapi/JsonTypeDefinitionBeaconRestApi.java to include the new endpoint.
• Added data/beaconrestapi/src/main/java/tech/pegasys/teku/beaconrestapi/handlers/v2/beacon/GetAttesterSlashingsV2.java for the new endpoint handler.
• Added data/beaconrestapi/src/test/java/tech/pegasys/teku/beaconrestapi/handlers/v2/beacon/GetAttesterSlashingsV2Test.java for unit tests of the new handler.

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