feat: tf plan full scan flag support

[rontalx]

What does this PR do?

Adds a new flag that supports scanning the full state of a terraform plan (the default is scanning only the delta).

snyk iac test tfplan.json --scan=resource-changes --experimental
snyk iac test tfplan.json --scan=planned-values --experimental

Where should the reviewer start?

New flag:
src/cli/commands/test/iac-local-execution/types.ts
src/cli/commands/test/iac-local-execution/assert-iac-options-flag.ts

Updated control flow:
src/cli/commands/test/iac-local-execution/index.ts
src/cli/commands/test/iac-local-execution/file-parser.ts

Tests:
test/jest/unit/iac-unit-tests/assert-iac-options-flag.spec.ts
test/smoke/spec/iac/snyk_test_local_exec_spec.sh

Documentation:
help/commands-docs/iac.md

What are the relevant tickets?

https://snyksec.atlassian.net/browse/CC-819

Slack Threads:

https://snyk.slack.com/archives/CS61093QC/p1619695624205800
https://snyk.slack.com/archives/CMM9V3XPY/p1619611809119700

[github-actions]

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[github-actions]

Expected release notes (by @rontalx)

features:
tf plan full scan flag support (8800697)

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