chore: configure coverage settings in pyproject.toml (#51)

- Add [tool.coverage.run] with source and branch coverage
- Add [tool.coverage.report] with exclude patterns and show_missing

Closes #43

pyproject.toml

@@ -4,3 +4,21 @@ testpaths = ["tests"]
 asyncio_mode = "auto"
 asyncio_default_fixture_loop_scope = "function"
 norecursedirs = ["tmp", "assets", "node_modules", "dist", "build", "web", "tools"]
+
+[tool.coverage.run]
+source = ["src"]
+branch = true
+omit = [
+    "src/__pycache__/*",
+    "src/*/__pycache__/*",
+]
+
+[tool.coverage.report]
+exclude_lines = [
+    "pragma: no cover",
+    "def __repr__",
+    "raise NotImplementedError",
+    "if __name__ == .__main__.:",
+    "if TYPE_CHECKING:",
+]
+show_missing = true