Add Property Feature.

[adamstorek]

Adding a property feature that represents a class attribute access as discussed in #1110.

[github-actions]

Please add bug fixes, new features, breaking changes and anything else you think is worthwhile mentioning to the master (unreleased) section of CHANGELOG.md. If no CHANGELOG update is needed add the following to the PR description: [x] No CHANGELOG update needed

[mr-tz]

covered in #1122? do we need the duplicate here?

[adamstorek]

covered in #1122? do we need the duplicate here?

It's also covered in #1080, but @mike-hunhoff wanted me to create a separate pull request for the property feature.

[mike-hunhoff]

We had two projects (#1080 and #1122) developing this code so to avoid duplicating work we asked @adamstorek to open a PR containing his implementation. This allowed both projects to move forward with a single implementation. Once v4 is released we can merge this PR so both projects are up-to-date w/ master.

[mr-tz]

ah, gotcha!

[mike-hunhoff]

This PR is outdated due to recent changes resulting from #1142 . Required updates were made to #1168 branched from #1122 branched from here so we are closing this PR.