Lint internal SQL as part of automated checks

This issue highlights a need to lint SQL as part of automated checks performed with code changes. Doing this might help prevent issues like #105 from coming up and make maintenance less error-prone.

One approach might be to use [typing `NewType`](https://docs.python.org/3/library/typing.html#newtype)'s to help capture and signify how SQL strings might differ from other strings.

For example:
```python
from typing import NewType

# Define a custom type hint for SQL strings
SQLString = NewType('SQLString', str)
```

From here, these strings could be gathered and linted from within the Python modules where they might be found.

Generally, this might be at odds with #77, where the use of these strings may diminish in future development.