Add Terraform dependency lock file to integrations using Terraform

[endorama]

With elastic/package-spec#269 the package spec has been updated to support .terraform.lock.hcl in _dev/deploy/tf folder. This support will be released with [email protected]

Supporting Terraform dependency lock file is good as the file helps with reproducible installations of Terraform providers. This helps having a consistent experience locally and in the CI environment (exactly like we pin the go language version).

The only package identified to use Terraform at the moment is aws.

• Adding .terraform.lock.hcl to aws package

[endorama]

Current AWS task is blocked, waiting on the release of elastic-package (that should contain [email protected])