Trading-strategy

- Added custom `DEXTrader` base class, as the default logic with Backtrader was a bit insufficient

- Added trade analysis support for Backtrader strategies (earlier was QSTrader only)

- Reworked trade analysis summaries and views

- Added [advanced example for Double 7 trading strategy](https://tradingstrategy.ai/docs/programming/algorithms/double-7-advanced.html)

- Polish API key welcome setup

- Fixed not reading settings file from Google Drive

**Note**: A full changelog is not available as long as `trade-executor` package is in active beta developmnt.

- Breaking API changes


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