Introduce Pipenv

Replace requirements.txt with pipenv for consistent development
environments.
Added additional development dependencies.

Pipfile

+[[source]]
+url = "https://pypi.org/simple"
+verify_ssl = true
+name = "pypi"
+
+[packages]
+alembic = "*"
+argon2-cffi = "*"
+flask-sqlalchemy = "*"
+flask = "*"
+ldap3 = "*"
+requests = "*"
+sqlalchemy = "*"
+
+[dev-packages]
+black = "*"
+mypy = "*"
+types-requests = "*"
+types-ldap3 = "*"
+
+[requires]
+python_version = "3.12"
+python_full_version = "3.12.4"

requirements.txt

-alembic~=1.12.1
-argon2-cffi~=23.1.0
-Flask-SQLAlchemy~=3.1.1
-Flask~=3.0.0
-ldap3~=2.9.1
-requests~=2.32.3 
-SQLAlchemy~=2.0.23