feat(plan,apply): add argument for lock timeout

[andrebask]

Addresses #82

This allows specifying a lock timeout value when running plan or apply. It is useful when running different builds in parallel that run the same terraform plan (It frequently happens if you have Dependabot enabled), they will fail unless you set a lock timeout.

[andrebask]

@KyleTryon

[KyleTryon]

Excellent addition. Thank you. Executing the tests now.

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