9.0: Generic `CandleComponent` value

Thanks to @dam5h , this crate now support a generic type as the value of a CandleComponent, for much greater user flexibility.
Two new CandleComponent's exist now:

• OpenDateTime: Keep track of the opening DateTime<Utc> of a candle
• OpenTimestamp: Keep track of the opening timestamp of a candle

Beyond that the TakerTrade is now able to specify the timestamp_resolution for greater user flexibility.

Exciting stuff, happy building everyone!