teams_automation: add teams_automation folder for automated Microsoft Teams call testing

Includes lf_interop_teams.py script to:
- Select and manage test devices
- Launch Teams calls with audio/video options
- Collect and log per-device call metrics
- Generate reports
- Support running the test through CLI or web UI

Signed-off-by: Narayana-CT <narayana.pinapatruni@candelatech.com>

Author: Narayana-CT