Function getRDSFamilyCategory

getRDSFamilyCategory(family: RDSInstanceFamily): RDSCategory
Get the category for an RDS instance family.
Parameters
- family: RDSInstanceFamily
  The instance family (e.g., "M5")
Returns RDSCategory
The category (e.g., "general_purpose")
Example
```
import { getRDSFamilyCategory } from 'aws-instance-info'

const category = getRDSFamilyCategory('M5')
console.log(category) // 'general_purpose'

const category2 = getRDSFamilyCategory('R6g')
console.log(category2) // 'memory_optimized'
```
- Defined in rds.ts:153