* Athena.py: cretaed variable for too long line, removed disabled pylint rule.
* Enabled `line-too-long` in `drill.py`. Added variable for too long string.
* Reformatted hana.py:
- changed return statement into two lines to keep line lenght limit
* Enabling pylint rule in hive.py:
- `no-name-in-module` for pyhive in several places
- `line-too-long` and adding new lines
- `unused-import` is not invalid anymore
* Enabled `line-too-long` in `kylin.py`. Added variable for too long string.
* Enabled `unused_import` in `base.py` from db_engine_specs module.
* Enabled `unused_import` in `bigquery.py` from db_engine_specs module.
* Enabled `unused_import` in `druid.py` from db_engine_specs module.
* fix: athena datetime string converting
* feat: Add new timegrains and convert_dttm to Druid engine spec
* Add TemporalType enum and fix test case
* Remove DATETIME for athena (original spec)
