refactor: update naming convention

Updates naming convention to pubkycore throughout project.
Updated bindings accordingly.
Added python bindings.

bindings/ios/module.modulemap

@@ -1,6 +1,6 @@
 // This file was autogenerated by some hot garbage in the `uniffi` crate.
 // Trust me, you don't want to mess with it!
-module pubkymobileFFI {
-    header "pubkymobileFFI.h"
+module pubkycoreFFI {
+    header "pubkycoreFFI.h"
     export *
 }