Switch to Tombi as TOML formatter and linter

[redeboer]

• https://tombi-toml.github.io/tombi
• VS Code Extension
• ✔️ Removes the need for tomlsort
• ✔️ Improved linting
• ✔️ Would finally resolve Merge developer configurations into pyproject.toml #98
• ❌ Somehow keeps hanging on Poe the Poet task definitions (still relevant?)