Implement DynamoDBRead class.

[nasudadada]

Summary

• Add functionality to read data from DynamoDB tables and output as CSV or JSONL

Key features

• Specify table name, output directory, file name, and file format
• Support for CSV and JSONL output formats

This commit enables users to efficiently export data from DynamoDB tables.

Brief

This PR adds a new feature to read data from DynamoDB tables and export it as CSV or JSONL format. Key features include:

1. User-specifiable parameters:

   • Table name
   • Output directory
   • File name
   • File format (CSV or JSONL)

2. Supported output formats:

   • CSV
   • JSONL

The current implementation uses a scan operation to retrieve all data stored in the table. This feature addition enables users to export data from DynamoDB tables.

Points to Check

• Following other implementations, exception handling and logging have been kept minimal. Is this approach acceptable?
• Are there any implementation aspects missing from this OSS implementation? Please check if I'm overlooked any considerations, particularly regarding data consistency or performance.
• Given that we're using a scan operation to retrieve all data, please confirm if this method is appropriate in terms of impact and performance for large tables.
• Does this implementation align with the style of this OSS project?

Test

Confirmed

• Added test code to verify proper functionality.
• Confirmed file output works correctly using the feature in actual scenarios.

Review Limit

None

Additional Information

• In the current implementation, we are only using scan operations, but I am considering applying query operations with partition keys and sort keys when the opportunity arises.:
  • Adding partition key and sort key parameters to the interface to allow data filtering
  • Adding support for query operations