Simplify using py_project

projects/proquint/BUILD

@@ -1,16 +1,6 @@
-py_library(
+py_project(
-  name = "lib",
+    name = "proquint",
-  srcs = glob(["src/python/**/*.py"]),
+    test_deps = [
-  imports = [
-    "src/python",
-  ],
-)
-
-py_pytest(
-  name = "test",
-  srcs = glob(["test/python/**/*.py"]),
-  deps = [
-    ":lib",
         py_requirement("hypothesis"),
     ],
 )