Refactor paths and runtime names (#507)

chore: refactor for consistant naming of the crates and paths of the runtimes

* tests: ignore folder created by the tests
* chore: refactoring
* Update polkadot-parachains/Cargo.toml

Co-authored-by: Bastian Köcher <bkchr@users.noreply.github.com>

cumulus/.gitignore

@@ -3,5 +3,5 @@
 .vscode
 .DS_Store
 /.cargo/config
-
+polkadot_argument_parsing
 **/node_modules