Function getRDSInstanceInfo

getRDSInstanceInfo(instanceClass: string): Promise<RDSInstanceDetails>
Get detailed information for a specific RDS instance class. Triggers the initial bulk fetch on first call; subsequent calls use LRU cache.
Parameters
- instanceClass: string
  The instance class (e.g., "db.m5.large")
Returns Promise<RDSInstanceDetails>
Promise resolving to instance class details including vCPUs, memory, network, and storage specs
Example
```
import { getRDSInstanceInfo } from 'aws-instance-info/async'

const instance = await getRDSInstanceInfo('db.m5.large')
console.log(instance.instanceClass) // 'db.m5.large'
console.log(instance.vCPUs) // 2
console.log(instance.memoryGiB) // 8
console.log(instance.networkBandwidthGbps) // 'Up to 10'
```
- Defined in rds.async.ts:149