impl kb_info & dialog_info & doc_info (#9)

* feat: impl kb_info & dialog_info

* feat: impl doc_info apis

src/service/mod.rs

@@ -1,2 +1,4 @@
 pub(crate) mod dialog_info;
-pub(crate) mod tag_info;
+pub(crate) mod tag_info;
+pub(crate) mod kb_info;
+pub(crate) mod doc_info;