add post aggregate and proofs V2 API

[mehdi-aouadi]

PR Description

Add PostAggregateAndProofsV2 API:

• Refactor the SignedAgrgegateAndProofs and AggregateAndProofs schemas to consider pre/post Electra
• Use SchemaDefinitionCache instead of SchemaDefinition in the old V1
• Deprecate the V1 API

Fixed Issue(s)

fixes #8439

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

This pull request implements the new PostAggregateAndProofsV2 API to support EIP-7549 (Electra upgrade) while maintaining backward compatibility.

• Added new PostAggregateAndProofsV2 endpoint in /data/beaconrestapi/src/main/java/tech/pegasys/teku/beaconrestapi/handlers/v2/validator/PostAggregateAndProofsV2.java
• Modified SignedAggregateAndProof and AggregateAndProof schemas in /ethereum/spec/src/main/java/tech/pegasys/teku/spec/datastructures/operations/ to support pre/post Electra configurations
• Updated schema definitions in /ethereum/spec/src/main/java/tech/pegasys/teku/spec/schemas/ to accommodate Electra changes
• Added integration tests for the new V2 API in /data/beaconrestapi/src/integration-test/java/tech/pegasys/teku/beaconrestapi/v2/validator/PostAggregateAndProofsV2IntegrationTest.java
• Deprecated the V1 API in /data/beaconrestapi/src/main/java/tech/pegasys/teku/beaconrestapi/handlers/v1/validator/PostAggregateAndProofs.java

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