add type hints to Experiment.py and dac.py, set up pyrefly as dev dependency

pyproject.toml

@@ -39,6 +39,9 @@ maintainers = [
 [project.scripts]
 DAMARIS3 = "damaris.__main__:main"
 
+[dependency-groups]
+dev = ["pyrefly"]
+
 [tool.setuptools.packages.find]
 where = ["src"]
 
@@ -50,6 +53,15 @@ version = {attr = "damaris.__version__"}
 
 [tool.setuptools.data-files]
 "share/python3-damaris/images" = ["src/damaris/gui/DAMARIS3.png", "src/damaris/gui/DAMARIS3.ico"]
+
+[tool.pyrefly]
+project-includes = [
+    "src/damaris/experiments/Experiment.py",
+    "src/damaris/experiments/dac.py",
+]
+search-path = ["src"]
+python-version = "3.11"
+python-platform = "linux"
 #"share/python3-damaris/doc" = ["doc/index.html"]
 #"share/python3-damaris/doc/reference-html" = ["doc/reference-html/*"]
 #"share/python3-damaris/doc/tutorial-html" = ["doc/tutorial-html/*"]