feature/update functionality

[r-el]

• ** -Add update(id, data, callback method -Implement write queue for update operations to prevent race conditions**
• Add tests for update operations
• Add test script for update operations in package.json

[r-el]

Implement UPDATE functionality with queue support

• Added update(id, data, callback) method with queue integration
• Tests -> basic update, verification, error handling, new fields, concurrent updates
• Updated package.json scripts to include test:update