feat(cli): Added 'exec' hook event.
feat(context): Added 'ctx' property to 'generateHelp' hook event.
fix(parser): Fixed bug in server mode where 'parse' hook event was being omitted from the cloned context which is not accessible instead of the originating 'CLI' instance.
fix(cli): Fixed issue with server mode execution where a context would be deeply cloned, however 'Command' and 'Extension' objects were passed by reference.
chore: Updated dependencies.