Add support for complex data types

[tsahiduek]

Feature Description

Problem Statement:
For complex objects, such as ACK DyanmoDB Table definition, there's a need to define a complex data-types that will be used as an input for the ResourceGroup.
As an example, ACK DynamoDB Table gets as an input, a list of the following struct:

 attributeDefinitions:
    - attributeName: id
      attributeType: S
    - attributeName: name
      attributeType: S

Currently there's no way to define the following:

tableElement: map[string][string]
attributeDefinition: []tableElement

Proposed Solution:
support complex data types to be able to pass those as an input to the ResourceGroup spec values.

Alternatives Considered:
none

Additional Context:
none

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