Support SSM (Systems Manager) parameters

[ltflb-bgdi]

Describe the enhancement:
There are two ways to store secrets in AWS:

• AWS Secrets-Manager
• SSM parameter store

Currently, only aws secrets are supported:
config.yaml
Deployment

Even though the docu only mentions secrets manager, the name of the parameter ElasticServerlessForwarderSSMSecrets gives the impression that SSM is suppored as well, what seems not to be the case.

It would be very helpful to additionally support ssm parameters as well.

Describe a specific use case for the enhancement or feature:
Using credentials stored in ssm parameter store instead of sectets manager

Config example/proposal

Deployment:

parameter:
  ElasticServerlessForwarderSSMParameters: ["arn:aws:ssm:eu-central-1:123456:parameter/es_url"]

config.yaml:

inputs:
  - type: "s3-sqs"
    id: "arn:aws:sqs:%REGION%:%ACCOUNT%:%QUEUENAME%"
    outputs:
      - type: "elasticsearch"
        args:
          elasticsearch_url: "arn:aws:ssm:eu-central-1:123456789:parameter:es_url"