Add custom message with current time in console when the user exits an app

[quietpigeon]

All Submissions:

• Have you followed the guidelines stated in CONTRIBUTING.md file?
• Have you checked to ensure there aren't any other open Pull Requests for the desired changed?

Type of change

Please delete options that are not relevant.

• New feature (non-breaking change which adds functionality)

New Feature Submission:

• Does your submission pass the tests?
• Have you linted your code locally prior to submission?

After these steps, you're ready to open a pull request.

a. Give a descriptive title to your PR.

b. Describe your changes.

c. Put `closes #XXXX` in your comment to auto-close the issue that your PR fixes (if such).

[quietpigeon]

closes #1261

[masenf]

@picklelo check out the integration test failures on this PR. Looks like dnspython released 2.4.0 yesterday which dropped <3.8 support and seems to have broken the tests by depending on an new version of httpcore. I haven't investigated yet, but FYI.

[masenf]

re-approving to see if the integration tests can pass now