[Feature] Cleaner Call of DBT CLI as Python Module

[vicmattos]

Is this your first time submitting a feature request?

• I have read the expectations for open source contributors
• I have searched the existing issues, and I could not find an existing issue for this feature
• I am requesting a straightforward extension of existing dbt functionality, rather than a Big Idea better suited to a discussion

Describe the feature

Execute python -m dbt.cli instead of python -m dbt.cli.main

Describe alternatives you've considered

Leave the way it is (ugly, but it works).

Who will this benefit?

DBT users that want to make sure the executable is the one installed in a specific Python Environment

Are you interested in contributing this feature?

yes

Anything else?

Already have a PR: #10848