feat: separate package for PackageManager util

[arpitBhalla]

Summary:

• Separated PackageManager into another package

Related https://github.com/rise-tools/rise-tools/issues/161

Test Plan:

Checklist

• [x] Documentation is up to date to reflect these changes.
• [x] Follows commit message convention described in CONTRIBUTING.md

^ @grabbou

[szymonrybczak]

@arpitBhalla can you take a look at failing tests? :pray:

[github-actions[bot]]

There hasn't been any activity on this pull request in the past 3 months, so it has been marked as stale and it will be closed automatically if no further activity occurs in the next 7 days.