Dynamodb, SQS, Firehose, Lambda endpoints for me-central -1

[ashutoshrishi]

Changes

Confirmation on the Dynamo region availability:

1. AWS regions for Dynamodb - https://docs.aws.amazon.com/general/latest/gr/ddb.html
2. Boto Core = https://github.com/boto/botocore/blob/d9d12af6e09ac587b506ec9f7a50082d0566f910/botocore/data/endpoints.json#L7494

Confirmation on the SQS region availability:

1. AWS regions for SQS - https://docs.aws.amazon.com/general/latest/gr/sqs-service.html#sqs_region
2. Boto Core - https://github.com/boto/botocore/blob/develop/botocore/data/endpoints.json#L22454

Checks

• [x] Run mix format using a recent version of Elixir
• [x] Run mix dialyzer to make sure the typing is correct
• [x] Run mix test to ensure no tests have broken (also please make sure you've added tests for your particular change, where appropriate).