feat: Add control to use timestamp to trigger the package creation or not (useful for CI/CD)

[samuel-phan]

Description

Add a variable trigger_on_package_timestamp (boolean - defaults to true) to whether use timestamp to trigger the package creation or not.

Motivation and Context

Problem

1. Use the lambda module to create a lambda. Run terraform apply. The lambda is created.
2. Delete the builds directory (to simulate a CICD job with an empty environment).
3. Run terraform plan again, it will detect a drift because the timestamp has changed.

One solution was to add the variable recreate_missing_package = false, but when the CICD job (without any builds directory) runs terraform apply will face this error:

│ Error: Provider produced inconsistent final plan
│
│ When expanding the plan for module.foo_lambda.aws_lambda_function.this[0] to include new values learned so far during apply, provider "registry.terraform.io/hashicorp/aws"
│ produced an invalid new value for .source_code_hash: was cty.StringVal("cqn6fMnsZk+KB1YcvY+mV9lVQvKZ7T7n+vpBjv/qg3s="), but now
│ cty.StringVal("mM6yOCDC4GsOEw8Sqyb7t1aZPQqbwu/g27igFYoF6ko=").
│
│ This is a bug in the provider, which should be reported in the provider's own issue tracker.

Solution

Add a variable trigger_on_package_timestamp (boolean - defaults to true) to whether use timestamp to trigger the package creation or not.

Fix #396

Breaking Changes

None.

How Has This Been Tested?

• I have updated at least one of the examples/* to demonstrate and validate my change(s)
• I have tested and validated these changes using one or more of the provided examples/* projects

• I have executed pre-commit run -a on my pull request

I have added an example/simple-cicd with a test.sh inside to run the test scenario.

[github-actions]

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[samuel-phan]

@antonbabenko Would you have some time to take a look at this PR please? 🙇

[antonbabenko]

Awesome work with this PR and test.sh in particular - it helped a lot!

[antonbabenko]

This PR is included in version 6.7.0 🎉

[github-actions]

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