feat: exec, run, info strict commands implementation, flags renaming.

[lev-ok]

Description

1. exec, run commands implementation.
2. Sorting and renaming CLI flags.
3. Automatic generation of environment variables.
4. Code refactoring.

Relates to #3445 .

Fixes #3757.

TODOs

Read the Gruntwork contribution guidelines.

• Update the docs.
• Run the relevant tests successfully, including pre-commit checks.
• Ensure any 3rd party code adheres with our license policy or delete this line if its not applicable.
• Include release notes. If this PR is backward incompatible, include a migration guide.

Release Notes (draft)

Added / Removed / Updated [X].

Migration Guide

Summary by CodeRabbit

• New Features

  • Introduced streamlined CLI commands (“run” and “exec”) to simplify command execution.
  • Simplified many command‐line flag names by removing legacy “terragrunt-” prefixes.
  • Added new experimental features and enhanced strict control mechanisms for better management of deprecated commands and flags.

• Bug Fixes

  • Enhanced logging with improved format handling and more reliable error reporting.
  • Refined strict mode checks to provide clearer warnings and errors regarding deprecated features.
  • Improved error handling in command execution and context management.

• Documentation

  • Updated documentation to reflect new flag names and configuration file conventions (e.g., using “root.hcl”).
  • Added migration guides to assist users in transitioning to the new CLI structure and flag naming conventions.

• Tests

  • Improved integration and unit tests for increased reliability and consistency.
  • Enhanced tests for strict controls and command execution to ensure accurate behavior and error reporting.