[Migrated] Support AWS SSM Parameter store for Environment Variables

[jneves]

Originally from: Miserlou/Zappa#1432 by OverlordQ

SSM Allows the creation of SecureString's which are variables protected by a KMS string which allows you to store sensitive information in a secure manner.[1]

This is the preferred method of storing environment or other data in plaintext as it stays encrypted in-flight.

[TreyWW]

Any ETA of this - or if it even be added? If not what would a better alternative be then using plaintext environment variables?