Allow tfplan format version 0.2

[mtranter]

A fix for #980

I reverse-engineered the existing pkg/iac-providers/tfplan/v1/testdata/valid-tfplan.json into vanilla terraform, and ran a plan using terraform V1.0.9 to generate the test file at pkg/iac-providers/tfplan/v1/testdata/valid-tfplan-0.2.json

Apologies for any non-idiomatic golang. I'm not that familiar with it.

[sonarcloud]

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[cesar-rodriguez]

@mtranter thanks for the PR!

[codecov]

Codecov Report

Merging #1074 (bf88232) into master (6a849d4) will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #1074      +/-   ##
==========================================
+ Coverage   78.59%   78.61%   +0.01%     
==========================================
  Files         238      238              
  Lines        6495     6499       +4     
==========================================
+ Hits         5105     5109       +4     
  Misses       1077     1077              
  Partials      313      313              

Impacted Files	Coverage Δ
pkg/iac-providers/tfplan/v1/load-file.go	77.14% <100.00%> (+2.94%)	⬆️

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[phoehnel]

Could it be the case, that there is an additional file, that needs to be changed @mtranter @cesar-rodriguez ?

On the most recent version (0.14.0) i get the following error:

user@host: ~/$ terrascan scan $TERRASCAN_ARGS -i tfplan --iac-version "0.2" 
2022-04-01T16:49:37.645Z        error   runtime/validate.go:136 iac type 'tfplan', version '0.2' not supported

The help states something simillar:

[...]
--iac-version string        iac version (arm: v1, cft: v1, docker: v1, helm: v3, k8s: v1, kustomize: v2, v3, v4, terraform: v12, v13, v14, v15, tfplan: v1)

[ruijarimba]

Hi all, I've started using terrascan recently and I have the same problem reported by @uupascal - how to fix it?

Thanks,
Rui