Add option to generate a single snapshot view from CLI (facebook#56071)

Summary:

Changelog: [Internal]

Adds `--view` argument to the snapshot generator, which allows to generate a single snapshot view instead of all of them.

Differential Revision: D96280524

Author: j-piasecki

scripts/cxx-api/parser/__main__.py

@@ -198,6 +198,11 @@ def main():
         type=str,
         help="Directory containing committed snapshots for comparison (used with --check)",
     )
+    parser.add_argument(
+        "--view",
+        type=str,
+        help="Name of the API view to generate",
+    )
     parser.add_argument(
         "--test",
         action="store_true",
@@ -250,6 +255,9 @@ def main():
     def build_snapshots(output_dir: str, verbose: bool) -> None:
         if not args.test:
             for config in snapshot_configs:
+                if args.view and config.snapshot_name != args.view:
+                    continue
+
                 build_snapshot_for_view(
                     api_view=config.snapshot_name,
                     react_native_dir=react_native_package_dir,