* Move sharding internal to StateManager
Avoid leaking sharding implementation details all over the State class and
breaking the API
* WiP StateManager based sharding
* Copy the state __dict__ when serializing to avoid breaking the instance
* State tests need to pass the correct substate token for redis
* state: when getting parent_state, set top_level=False
ensure that we don't end up with a broken tree
* test_app: get tests passing with redis by passing the correct token
refactor upload tests to suck less
* test_client_storage: look up substate key
* state.py: pass static checks
* test_dynamic_routes: working with redis state shard
* Update the remaining AppHarness tests to pass {token}_{state.get_full_name()}
* test_app: pass all tokens with state suffix
* StateManagerRedis: clean up commentary
* test_client_storage: remove race conditions for cookie assignment
Poll for default timeout for cookies to appear in the controlled browser.
* Remove use of deprecated get_token and get_sid in core
Both reflex.app and reflex.state were still using deprecated methods, which
were throwing unsolvable warnings for end users.
* Remove deprecated router functions from integration tests
Mostly removing custom "token" var and replacing with
router.session.client_token.
Also replacing `get_query_params` and `get_current_page` usage as well.
* fix upload tests
Cannot pass substate as main app state, since it blocks us from accessing
"inherited vars"
* state: do NOT reset `router` to default
When calling `.reset` to reset state vars, do NOT reset the router data, as
that could mess up internal event processing.
