FEATURE #716 - use decorators and remove deprecated features

[git-tirthankar]

Describe your changes

removed deprecated features and new decorators auto_get_source and auto_finalize as per: https://bc-security.gitbook.io/empire-wiki/module-development/powershell-modules#decorators

Issue ticket number and link (if there is one)

Checklist before requesting a review

• I have performed a self-review of my code
• If it is a core feature, I have added thorough tests.
• I have added an entry to CHANGELOG.md
• I have updated the documentation in docs/ (if applicable)

[vinnybod]

Changes look good to me, thanks!
Can you run the linting/formatting so the CI can run all the way through?

https://github.com/BC-SECURITY/Empire/blob/main/.github/CONTRIBUTING.md#code-formatting-and-linting

If you install pre-commit, you can run it on your previous commit with pre-commit run --from-ref HEAD~ --to-ref HEAD