Multiple refinements on loaders:

- Cache stat collection enabled.
- Implemented ONNX loading.
- Add ability to specify the repo version variant in installer CLI.
- If caller asks for a repo version that doesn't exist, will fall back
  to empty version rather than raising an error.

invokeai/backend/model_manager/util/select_hf_files.py

@@ -41,13 +41,21 @@ def filter_files(
     for file in files:
         if file.name.endswith((".json", ".txt")):
             paths.append(file)
-        elif file.name.endswith(("learned_embeds.bin", "ip_adapter.bin", "lora_weights.safetensors")):
+        elif file.name.endswith(
+            (
+                "learned_embeds.bin",
+                "ip_adapter.bin",
+                "lora_weights.safetensors",
+                "weights.pb",
+                "onnx_data",
+            )
+        ):
             paths.append(file)
         # BRITTLENESS WARNING!!
         # Diffusers models always seem to have "model" in their name, and the regex filter below is applied to avoid
         # downloading random checkpoints that might also be in the repo. However there is no guarantee
         # that a checkpoint doesn't contain "model" in its name, and no guarantee that future diffusers models
-        # will adhere to this naming convention, so this is an area of brittleness.
+        # will adhere to this naming convention, so this is an area to be careful of.
         elif re.search(r"model(\.[^.]+)?\.(safetensors|bin|onnx|xml|pth|pt|ckpt|msgpack)$", file.name):
             paths.append(file)
 
@@ -64,7 +72,7 @@ def _filter_by_variant(files: List[Path], variant: ModelRepoVariant) -> Set[Path
     result = set()
     basenames: Dict[Path, Path] = {}
     for path in files:
-        if path.suffix == ".onnx":
+        if path.suffix in [".onnx", ".pb", ".onnx_data"]:
             if variant == ModelRepoVariant.ONNX:
                 result.add(path)