Optimize Coroot AWS Agent to Handle Large Number of RDS Hosts

[YoranSys]

The Coroot AWS Agent is currently unable to efficiently process and monitor the large number of RDS hosts in our environment. This performance bottleneck is causing delays in data collection and reporting, potentially impacting our ability to monitor our AWS RDS infrastructure effectively.

Proposed Solution:

• Implement a worker pool for concurrent processing of RDS instances during discovery.
• Use sync.Map for thread-safe operations on the instances map.
• Collect metrics concurrently within each Collector.
• Utilize buffered channels for metric collection to reduce blocking.