Convert me fragment to kotlin

[planarvoid]

In order to remove view memory leaks and usage of an inner async task I've converted the MeFragment to kotlin. There are mostly no functionality changes. The only change is replacing the async task with a coroutine in a view model.

To test:

• Go to the Me screen and stress test it
• Try log out of WP.com
• The progress dialog is shown
• You're correctly logged out

PR submission checklist:

• I have considered adding unit tests where possible.
• I have considered adding accessibility improvements for my changes.
• I have considered if this change warrants user-facing release notes and have added them to RELEASE-NOTES.txt if necessary.

[peril-wordpress-mobile]

	Warnings
⚠️	PR has more than 500 lines of code changing. Consider splitting into smaller PRs if possible.

Generated by 🚫 dangerJS

[peril-wordpress-mobile]

You can trigger optional UI/connected tests for these changes by visiting CircleCI here.

[peril-wordpress-mobile]

You can test the changes on this Pull Request by downloading the APK here.

[malinajirka]

Thanks @planarvoid ! LGTM - feel free to merge it when you fix the lint issues.