feat!(): add custom execution context

lib/factories/telegraf-params-factory.ts

@@ -0,0 +1,23 @@
+import { TelegrafParamtype } from '../enums/telegraf-paramtype.enum';
+
+export class TelegrafParamsFactory {
+  exchangeKeyForValue<
+    TContext extends Record<string, any> = any,
+    TResult = any
+  >(type: number, ctx: TContext, next: Function): TResult {
+    switch (type as TelegrafParamtype) {
+      case TelegrafParamtype.CONTEXT:
+        return ctx as any;
+      case TelegrafParamtype.NEXT:
+        return next as any;
+      case TelegrafParamtype.SENDER:
+        return ctx.from;
+      case TelegrafParamtype.MESSAGE:
+        return ctx.message;
+      case TelegrafParamtype.MESSAGE_TEXT:
+        return ctx.message.text;
+      default:
+        return null;
+    }
+  }
+}