Feat: (issue#48) Add option to install Python3 for projects using TF Lambda module

[yiskaneto]

Description

Fixes https://github.com/gruntwork-io/terragrunt-action/issues/48

• Added the following 2 non-required inputs to install Python3 for projects that need to use the AWS Lambda Terraform module:
  • tg_install_python_3
  • tg_python_version
• The only version allowed at the moment are 3.10 and 3.11 which are the ones available on the package manager repository of the docker image.

Release Notes (draft)

• Added tg_install_python_3 and tg_python_version as non-required inputs for projects using the AWS Lambda Terraform module

Added / Removed / Updated [X].

Migration Guide

N/A