Qlib simulator refinement (redo of PR 1244) (#1262)

* Use dict-like configuration

* Rename from_neutrader to integration

* SAOE strategy

* Optimize file structure

* Optimize code

* Format code

* create_state_maintainer_recursive

* Remove explicit time_per_step

* CI test passed

* Resolve PR comments

* Pass all CI

* Minor test issue

* Refine SAOE adapter logic

* Minor bugfix

* Cherry pick updates

* Resolve PR comments

* CI issues

* Refine adapter & saoe_data logic

* Resolve PR comments

* Resolve PR comments

* Rename ONE_SEC to EPS_T; complete backtest loop

* CI issue

* Resolve Yuge's PR comments

qlib/constant.py

@@ -2,6 +2,11 @@
 # Licensed under the MIT License.
 
 # REGION CONST
+from typing import TypeVar
+
+import numpy as np
+import pandas as pd
+
 REG_CN = "cn"
 REG_US = "us"
 REG_TW = "tw"
@@ -10,4 +15,8 @@ REG_TW = "tw"
 EPS = 1e-12
 
 # Infinity in integer
-INF = 10**18
+INF = int(1e18)
+ONE_DAY = pd.Timedelta("1day")
+ONE_MIN = pd.Timedelta("1min")
+EPS_T = pd.Timedelta("1s")  # use 1 second to exclude the right interval point
+float_or_ndarray = TypeVar("float_or_ndarray", float, np.ndarray)