begin rewriting first services to be domain agnostic

more rewrites

core/src/features/text-based-feature/text-based-feature.schema.ts

@@ -0,0 +1,9 @@
+export type TextBasedFeatureHandleMessageSend = (
+	message: string,
+	channelId: string,
+) => void | Promise<void>;
+
+export type TextBasedFeatureInput = {
+	channelId: string;
+	handleMessageSend: TextBasedFeatureHandleMessageSend;
+};