Upgrade indexer v2 and Add Query Interface for Received Transactions.

[sssning121]

Expected Behavior

The system should upgrade to indexer v2 to enhance performance and scalability. Additionally, a new interface for querying received transactions should be implemented to resolve the congestion issue in automatic transaction reception.

Specifications

1. System should be compatible with indexer v2.
2. The query interface should correctly return all transactions that have already been received.
3. Performance improvements are expected to address the automatic transaction reception congestion.

Features

1. Upgrade to indexer v2.
2. Add an interface to query already received transactions to fix congestion in automatic transaction reception.

Development Tasks

• Upgrade indexer to v2.
• Implement the query interface for received transactions.
• Test the new functionality to ensure the congestion issue is resolved.