Add Savanna system contract support and fix autokick

[molty365]

Summary

• Add Savanna finalizer key support to the Telos system contract.
• Add switchtosvnn to establish the first finalizer policy and transition consensus.
• Guard the Savannah switch so the live active schedule must match Telos schedule metrics and every scheduled producer must have an active finalizer key.
• Fix Telos missed-block autokick under Savanna by preserving schedule metrics across no-op schedule proposals.
• Avoid double-counting lifetime_missed_blocks when a producer is kicked for missed blocks.

Root cause fixed

Under Savanna, update_elected_producers can repeatedly call set_proposed_producers with an unchanged producer schedule. Telos was treating each successful proposal as a fresh schedule metrics reset, which wiped missed-block counters before autokick could reach the configured threshold. The fix only rebuilds schedule metrics when the producer membership actually changes.

The separate system_rotation.cpp change removes a manual lifetime_missed_blocks increment because producer_info::kick() already applies that increment before resetting the per-rotation counter.

Validation

• git diff --check
• Built eosio.system with telos-cdt:4.1.1 Docker image.
• Live Savanna autokick rehearsal: forced one producer to miss blocks, producer was kicked at 660 missed blocks, schedule/finalizer policy excluded the kicked producer, and finality remained healthy.

Notes

• Opened as draft pending testnet rehearsal with real BP finalizer keys.
• Local C++ unit test harness was not included in this PR; the workspace test build still needs separate Spring/CDT harness cleanup.