[BUG] Fix incorrect data parsing/naming

[nickjustincase]

Expected Behavior

Possible fix:

• def _set_interval(self, df: pd.DataFrame)
• def _df_datetime_format(self, df: pd.DataFrame, exclude_lowercase=None)
• def _single_datetime_format(self, arg) -> float

patches:

1. time interval s (possible issues if interval less second) - abstract.py.patch_s.txt

2. time interval ms - abstract.py.patch_ms.txt

Current Behaviour

Example of 1M history data: history_BTCUSDT_1M.csv

Reproducible Example

1. 1M history for > 1 month. eg. 08-10.2022:
2. Last 1M data completed (next 5m tick is new month).
3. Mew 1M data collects by lower timeframes.

Environment

- OS: any
- Library: 2.1