refactor: centralize types (#235)

* Centralize types and structures

* Resolve Conflict

* Update cache.ts

src/structures/structures.ts

@@ -0,0 +1,7 @@
+export * from "./channel.ts";
+export * from "./guild.ts";
+export * from "./member.ts";
+export * from "./message.ts";
+export * from "./mod.ts";
+export * from "./role.ts";
+export * from "./template.ts";