Add shared read-only Git and database research tools

pyproject.toml

@@ -11,6 +11,7 @@ dependencies = ["jsonschema>=4.18,<5"]
 
 [project.optional-dependencies]
 test = ["pytest>=8,<10"]
+research = ["PyMySQL>=1.1,<2", "zstandard>=0.23,<1"]
 
 [tool.setuptools.packages.find]
 where = ["src"]