backtester v0.1.0

Sr/initial development (#2)

* updates

* savepoint before switching to ndarray

* yet another savepoint

* rework cache dataprovider

* finish rework using actor model

* remove files that shouldn't have been committed, download 4 months at a time

* download all data before starting backtest

* use progressbars for download

* more iteration

* more updates

* clippy