Trading-strategy

- Add `exchange_universe` argument to `get_pair()`

- `GroupedCandleUniverse.create_from_single_pair_dataframe(time_bucket)` parameter added
- `TimeBucket.from_pandas_timedelta()` added

- Add support for fetching lending candle data with `fetch_lending_candles_by_reserve_id()`
- Rename `fetch_all_lending_protocol_reserves()` to `fetch_all_lending_reserves()`
- Delete `summarydataframe.py` and its dependents. This includes `backtrader.py` and the `TradeSummary.to_dataframe` method.
Backtrader has been unmaintained for a while.

- [Add loaded trading pair data preprocesing and working around Parquet data problems](https://github.com/tradingstrategy-ai/trading-strategy/issues/104)
- Add `DataDecodeFailed(Exception)` that gives more context information if there is something wrong
with the trading pair

- Fix test warnings by changing function calls from `create_single_pair_universe()` to `create_pair_universe()`
- Add `PairNotFoundError` and `ExchangeNotFoundError` for more helpful error messages
- Add `last_supposed_candle_at` data to `fetch_trading_data_availability()`

- Fix `fetch_trading_data_availability()` using wrong format for pair id array