Refactor and Improve Build and Clean Commands

[sanowl]

Motivation

This pull request aims to refactor and improve the build and clean commands in the project to enhance readability and maintainability. The changes focus on organizing imports, adding detailed docstrings, renaming functions for clarity, streamlining initialization checks, and improving logging for better error handling and information.

Have you read the Contributing Guidelines on pull requests?

Yes

Test Plan

The existing functionality has been retained and tested to ensure everything works as expected. No new tests were added. The improvements should be verified by running the existing build and clean commands and ensuring they function correctly. Special attention should be given to the following:

• The custom clean command should properly clean up the generated and junk files.
• The antlr command should generate parsers without errors.
• The build_py, develop, and sdist commands should work seamlessly with the updated code.

Related Issues and PRs

This PR is a standalone improvement and is not part of a group of changes. It addresses the need for better code maintainability and readability in the build and clean commands.

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[Jasha10]

Thanks, @sanowl.
It looks like CI is failing with an error ImportError: cannot import name 'Develop' from 'build_helpers.build_helpers' (/home/circleci/project/build_helpers/build_helpers.py).

It looks like renaming Develop to DevelopCommand has broken something.

If we go through with this change, I'd like to modify the OmegaConf:build_helpers.py file at the same time. That file has a lot in common with Hydra:build_helpers.py.