Remove SQLAlchemy and GeoAlchemy

[spwoodcock]

What type of PR is this? (check all applicable)

• 🍕 Feature
• 🐛 Bug Fix
• 📝 Documentation Update
• 🎨 Style
• 🧑‍💻 Code Refactor
• 🔥 Performance Improvements
• ✅ Test
• 🤖 Build
• 🔁 CI
• 📦 Chore (Release)
• ⏩ Revert

Related Issue

Fixes #22

Describe this PR

• Removes dependencies SQLAlchemy and GeoAlchemy.
• Replaced with direct psycopg2 driver usage.
• The rationale was described in the issue: to reduce subdependencies when installing fmtm-splitter (for users that don't use SQLAlchemy).
• I also fixed all the linting errors for pre-commit.

[spwoodcock]

I will merge this and make a pre-release for incorporating in FMTM.
(the release will be breaking --> 1.x.x)

Feel free to test/review & we can always update prior to the actual release.