feat(bot): add support for Discord message context commands (#513)

scripts/app-commands/common/__init__.py

@@ -0,0 +1 @@
+from .types import MessageCommand

scripts/app-commands/common/types.py

@@ -0,0 +1,7 @@
+class MessageCommand(dict):
+    COMMAND_TYPE = 3
+
+    def __init__(self, name):
+        super().__init__()
+        self["type"] = self.__class__.COMMAND_TYPE
+        self["name"] = name