Add support for multiple types and "dynamic parameters"

[kalleeh]

Add more dynamic support in the API for dynamic parameters and product types. Today they are somewhat hardcoded which makes it hard to extend applications, pipelines and services to new types with totally different parameters.

[kalleeh]

app_manager.py -> generate_params()

• Take another parameter for template_url Pseudo-code:

  CloudFormation.Client.get_template_summary
  Parameters[
      loop through and compare ParameterKey, if missing in payload throw
      if in payload but missing in Parameters, throw warning of unexpected parameter
      # added feature, parameter validation based on ParameterConstraints
  ]

https://boto3.amazonaws.com/v1/documentation/api/latest/reference/services/cloudformation.html#CloudFormation.Client.get_template_summary