Upgrade all packages to 2.0.0 API level

[bardram]

For all packages, do:

• Upgrade to CAMS API level 2.0.0
• Upgrade all sub-packages
• Remove dependency overrides in example pubspec and add // ignore_for_file: depend_on_referenced_packages to example.dart file

Core

• [x] carp_core
• [x] carp_mobile_sensing

Sampling Packages

• [x] carp_context_package
• [x] carp_connectivity_package
• [x] carp_apps_package
• [x] carp_communication_package
• [x] carp_audio_package
• [x] carp_survey_package
• [x] carp_health_package

Wearables

• [x] carp_movisens_package
• [x] carp_esense_package
• [x] carp_polar_package
• [x] carp_movesense_package

Backends

• [x] carp_webservices
• [x] carp_backend
• [ ] carp_firebase_backend

Apps

• [ ] carp_mobile_sensing_app
• [ ] pulmonary_monitor_app