Add TradeBuilder Strategy Support

[Martin-Molinero]

Expected Behavior

• TradeBuilder can detect strategies across multiple trades and generate a single trade per strategy

Actual Behavior

• Trade builder generates multiple 'trades' which mean stats are affected, 50% loss etc

Potential Solution

N/A

Reproducing the Problem

N/A

System Information

N/A

Checklist

• I have completely filled out this template
• I have confirmed that this issue exists on the current master branch
• I have confirmed that this is not a duplicate issue by searching issues

• I have provided detailed steps to reproduce the issue

[Martin-Molinero]

• Adding on top of this: lean engine should support custom models to handle trade building self.set_trade_builder(my_model) where my_model could implement a custom order tag based order grouping