Firebase on tvOS: analytics, crashlytics, performance & remote_config (PRs open) #11

First batch of Firebase *_tvos ports — each built with flutter-tvos plugin port and verified on a physical Apple TV 4K. PRs open:

• firebase_analytics_tvos — feat(firebase): tvOS support for firebase_analytics #7
• firebase_crashlytics_tvos — feat(firebase): tvOS support for firebase_crashlytics #8
• firebase_performance_tvos — feat(firebase): tvOS support for firebase_performance #9
• firebase_remote_config_tvos — feat(firebase): tvOS support for firebase_remote_config #10

All pinned to the firebase_core 4.11.x / firebase_core_platform_interface 7.1.0 train to match firebase_core_tvos.

Remaining Firebase plugins tracked separately:

• firebase_app_check — Port firebase_app_check to tvOS #12
• cloud_functions — Port cloud_functions to tvOS #13
• firebase_ai — Port firebase_ai to tvOS #14
• firebase_in_app_messaging — Port firebase_in_app_messaging to tvOS #15