Move @parity/resolc from js-revive (#296)

- Move npm package from paritytech/js-revive 
- Rename package to `@parity/resolc`

js/emscripten/fixtures/missing_import.json

@@ -0,0 +1,19 @@
+{
+  "language": "Solidity",
+  "sources": {
+    "fixtures/storage.sol": {
+      "content": "// SPDX-License-Identifier: UNLICENSED\npragma solidity ^0.8.0;\nimport \"nonexistent/console.sol\";\ncontract MyContract { function f() public { } }"
+    }
+  },
+  "settings": {
+    "optimizer": {
+      "enabled": true,
+      "runs": 200
+    },
+    "outputSelection": {
+      "*": {
+        "*": ["abi"]
+      }
+    }
+  }
+}