Support Point-in-time Data Operation (#343)

* add period ops class

* black format

* add pit data read

* fix bug in period ops

* update ops runnable

* update PIT test example

* black format

* update PIT test

* update tets_PIT

* update code format

* add check_feature_exist

* black format

* optimize the PIT Algorithm

* fix bug

* update example

* update test_PIT name

* add pit collector

* black format

* fix bugs

* fix try

* fix bug & add dump_pit.py

* Successfully run and understand PIT

* Add some docs and remove a bug

* mv crypto collector

* black format

* Run succesfully after merging master

* Pass test and fix code

* remove useless PIT code

* fix PYlint

* Rename

Co-authored-by: Young <afe.young@gmail.com>

scripts/data_collector/pit/requirements.txt

@@ -0,0 +1,9 @@
+loguru
+fire
+tqdm
+requests
+pandas
+lxml
+loguru
+baostock
+yahooquery