handling module inputs from other module outputs

[kapilt]

tfparse doesn't seem to handle passing outputs from module A as an input to module B.

the evaluation of the input within module B seems to only handle values known at module's B evaluation time.

This is due to behavior in the underlying golang library. Separately that golang library has been refactored
recently into a separate package (defsec -> trivy-iac). The current source for that evaluation is

https://github.com/aquasecurity/trivy-iac/blob/v0.7.1/pkg/scanners/terraform/parser/evaluator.go#L121

the location/version used by tfparse is defsec @ 0.90.1
https://github.com/aquasecurity/defsec/blob/988b9e9444c616a573dbbb670e65a05253e3ab2d/pkg/scanners/terraform/parser/evaluator.go#L118

wrt to resolution, it could be a question of fixing evaluateStep to consider module input changes. I think we need to validate
as well that the input variable outside the module is the same identity as the input variable inside the module, ie. there is a
common linkage for when the variable outside the module is resolved.

at the moment looking at the structure generated by tfparse

/root
  - mod-a output -> correct
  - mod-b input var -> correct
  /mod-b
      - input var -> unknown