[py] BiDi Python code generation from CDDL

Author: AutomatedTester

common/bidi/spec/BUILD.bazel

@@ -0,0 +1,13 @@
+package(
+    default_visibility = [
+        "//py:__pkg__",
+    ],
+)
+
+exports_files(
+    srcs = [
+        "all.cddl",
+        "local.cddl",
+        "remote.cddl",
+    ],
+)