Metadata difference command (#1015)

* diffing pallets and runtime apis

* print diff

* clippy fix and format

* change formatting

* fmt

* diff working with storage details

* fix diff

* cargo fmt

* remove printing of node

* change strings

* handle parsing differently

* clippy fix

* cargo fmt

* more abstraction

* clippy fix and fmt

* add unit test and ordering

* fix small issue

cli/src/commands/mod.rs

@@ -4,6 +4,7 @@
 
 pub mod codegen;
 pub mod compatibility;
+pub mod diff;
 pub mod explore;
 pub mod metadata;
 pub mod version;