feat: Add support for EFS File System Config

[niranjan94]

Description

Resolves #44

Motivation and Context

To support the new file_system_config which allows Lambdas to have EFS file systems mounted.

Breaking Changes

No breaking changes.

How Has This Been Tested?

• Tested on a project that requires file_system_config.

• Tested Plan & Apply. Works as expected.

   Terraform v0.12.29
   + provider.aws v2.70.0
   + provider.external v1.2.0
   + provider.local v1.4.0
   + provider.null v2.1.2
  

   Terraform v0.13.0
   + provider registry.terraform.io/hashicorp/aws v2.70.0
   + provider registry.terraform.io/hashicorp/external v1.2.0
   + provider registry.terraform.io/hashicorp/local v1.4.0
   + provider registry.terraform.io/hashicorp/null v2.1.2
  

[cageyv]

@niranjan94 , can you test it on aws 3.0 or 3.1?
It would be better if there was an opportunity to immediately switch to support for a new provider.
I also recommend using the new terraform 0.13.0 for tests.
This version is already allowed in the module and will probably be used automatically by others.

[niranjan94]

@cageyv good point. I'll test it out and post my updates here.

[antonbabenko]

@niranjan94 Thanks for this PR!

I have just added support for AWS provider v3 to this module and released v1.18.0, so if you have time, please finish this PR by adding a new example into examples folder with all required resources for EFS, and update formatting and documentation by running pre-commit run -a.

[niranjan94]

@antonbabenko thanks for your review. Have updated the PR with the requested changes.

[antonbabenko]

Thanks, @niranjan94 !

v1.19.0 has been just released. I have updated examples and added a note that Terraform 0.13 is recommended for EFS example to work.

[niranjan94]

@antonbabenko thanks a lot for quick merge + release 🎉

[github-actions]

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