Add metadata information to the listing of PassContext configuration listing function (#8226)

* Rename PassContext::ListConfigNames() to PassContext::ListConfigs() and its
   Python counterpart tvm.ir.transform.PassContext.list_config_names -> list_configs()

 * Adjust PassContext::ListConfigs() to include also metadata (currently only including the data type)

 * Adjust unit tests

python/tvm/ir/transform.py

@@ -121,9 +121,15 @@ class PassContext(tvm.runtime.Object):
         return _ffi_transform_api.GetCurrentPassContext()
 
     @staticmethod
-    def list_config_names():
-        """List all registered `PassContext` configuration names"""
-        return list(_ffi_transform_api.ListConfigNames())
+    def list_configs():
+        """List all registered `PassContext` configuration names and metadata.
+
+        Returns
+        -------
+        configs : Dict[str, Dict[str, str]]
+
+        """
+        return _ffi_transform_api.ListConfigs()
 
 
 @tvm._ffi.register_object("transform.Pass")