* fix: remove redundant deep copy
set_model_list already does the deep copy at the beginning of the call.
* fix: remove unused model_list arguments
The `model_list` parameter was being passed to classes that did not use it.
* fix: reduce per-request memory and time from O(N×M) to O(N)
No need to create a whole array for a simple look up.
* add: missing test
* fix: remove unused parameter
* fix router strat
* use async set / get cache in router_strategy
* add coverage for router strategy
* fix imports
* fix batch_get_cache
* use async methods for least busy
* fix least busy use async methods
* fix test_dual_cache_increment
* test async_get_available_deployment when routing_strategy="least-busy"
