MONGOSH-269 - Add nyc for test coverage

Author: addaleax

.nycrc

@@ -0,0 +1,10 @@
+{
+  "exclude": [
+    "test",
+    "testing",
+    "config",
+    "**/*.d.ts",
+    "**/*.spec.{ts,js,tsx,jsx,cjs,mjs}",
+    "**/*.config.{ts,js,tsx,jsx,cjs,mjs}"
+  ]
+}