Update resource_type in metadata json from string to map<string>bool and accordingly modify pre scan filter

[patilpankaj212]

• terrascan version: latest
• Operating System: all

Description

The resource_type attribute in policy metadata json is of string type. However, a policy can validate multiple resource types, eg: kubernetes_pod policies handle multiple kubernetes object types (kubernetes_deployment, kubernetes_job etc).

This modification will help in making the pre scan filter logic better.

This was the root cause of #946 and the filtering logic is fixed temporarily.

[patilpankaj212]

The commit was reverted, hence re-opening the issue.