Make tests a submodule of the repo

.gitignore

@@ -9,7 +9,6 @@ node_modules
 *.log
 
 profile.json.gz
-resolc-compiler-tests
 workdir
 
 !/schema.json

.gitmodules

@@ -1,3 +1,6 @@
 [submodule "polkadot-sdk"]
 	path = polkadot-sdk
 	url = https://github.com/paritytech/polkadot-sdk.git
+[submodule "resolc-compiler-tests"]
+	path = resolc-compiler-tests
+	url = https://github.com/paritytech/resolc-compiler-tests