Update code owners on repos

[gabog]

Summary

Update in scope repo code owners to use teams rather than individuals.

More specifically:

• Remove individuals
• Use only groups and only @microsoft/botframework-sdk
• Remove old groups (make a list based on what we find in our current repos)

As part of this PR we also made sure the microsoft/botframework-sdk is a member in all the repos below.

Repos in scope

• [x] sdk
• [x] dotnet
• [x] js
• [x] python
• [x] java
• [x] samples
• [ ] BF CLI PR merged but code owners doesn't seem to be turned on, need admin to configure it
• [x] Functional Tests
• [x] Botbuilder v3 (JS and dotnet)
• [x] DirectLine C#
• [x] DirectLine JS
• [x] Tools
• [ ] Solutions

We will not update ownership for the following:

• emulator
• webchat
• Components
• Composer
• OBI

TODO: update with any other repos we find later while doing this