chore: add jest tests, cleanup rpc

jest-reporter.js

@@ -0,0 +1,13 @@
+class BazelReporter {
+    onRunComplete(_, results) {
+        if (results.numFailedTests && results.snapshot.failure) {
+            console.log(`================================================================================
+      
+      Snapshot failed, you can update the snapshot by running
+      bazel run ${process.env['TEST_TARGET'].replace(/_bin$/, '')}.update
+      `);
+        }
+    }
+}
+
+module.exports = BazelReporter;