Replace requirements.txt with pipenv for consistent development environments. Pipenv maintains a superior Lockfile similar to NPM. Added additional development dependencies and mypy configuration.
This contains a package update too:
alembic
1.12.1
1.13.2
flask
3.0.0
3.0.3
SQLAlchemy
2.0.23
2.0.31
No changes between version 2 and version 2
