* Enabled mssql
* Enabling pylint rules in `mysql.py` from `db_engine_specs`:
- added variable to shorten line and enable `line-too-long`
- `import-error` seems not prompting anymore
- specified exception instead broad-except
* Refactored too long line in `oracle.py` from `db_engine_specs`. Enabled too-long-line pylint rule.
* Changed fstring into string `pinot.py` to reenable `f-string-without-interpolation` rule.
* Enabled `unused-import` rule and changed line to adjust to correct number of characters in `db_engine_specs/postgres.py`.
* Enabled unused-import pylint check in `db_engine_specs/presto.py`
* Enabled unused-import pylint check in `db_engine_specs/snowflake.py`
* Enabled unused-import pylint check in `db_engine_specs/sqlite.py`