feat: add mypy to the project

Signed-off-by: Dominik Willner <th33xitus@gmail.com>

pyproject.toml

@@ -2,7 +2,7 @@
 requires-python = ">=3.8"
 
 [project.optional-dependencies]
-dev=["ruff"]
+dev=["ruff", "mypy"]
 
 [tool.ruff]
 required-version = ">=0.3.4"
@@ -19,3 +19,14 @@ quote-style = "double"
 
 [tool.ruff.lint]
 extend-select = ["I"]
+
+[tool.mypy]
+python_version = "3.8"
+platform = "linux"
+# strict = true # TODO: enable this once everything is else is handled
+check_untyped_defs = true
+ignore_missing_imports = true
+warn_redundant_casts = true
+warn_unused_ignores = true
+warn_return_any = true
+warn_unreachable = true