final tidying before marking PR as ready for review

- Replace AnyModelLoader with ModelLoaderRegistry
- Fix type check errors in multiple files
- Remove apparently unneeded `get_model_config_enum()` method from model manager
- Remove last vestiges of old model manager
- Updated tests and documentation

resolve conflict with seamless.py

invokeai/backend/model_manager/load/optimizations.py

@@ -1,16 +1,16 @@
 from contextlib import contextmanager
+from typing import Any, Generator
 
 import torch
 
 
-def _no_op(*args, **kwargs):
+def _no_op(*args: Any, **kwargs: Any) -> None:
     pass
 
 
 @contextmanager
-def skip_torch_weight_init():
-    """A context manager that monkey-patches several of the common torch layers (torch.nn.Linear, torch.nn.Conv1d, etc.)
-    to skip weight initialization.
+def skip_torch_weight_init() -> Generator[None, None, None]:
+    """Monkey patch several of the common torch layers (torch.nn.Linear, torch.nn.Conv1d, etc.) to skip weight initialization.
 
     By default, `torch.nn.Linear` and `torch.nn.ConvNd` layers initialize their weights (according to a particular
     distribution) when __init__ is called. This weight initialization step can take a significant amount of time, and is
@@ -18,13 +18,14 @@ def skip_torch_weight_init():
     monkey-patches common torch layers to skip the weight initialization step.
     """
     torch_modules = [torch.nn.Linear, torch.nn.modules.conv._ConvNd, torch.nn.Embedding]
-    saved_functions = [m.reset_parameters for m in torch_modules]
+    saved_functions = [hasattr(m, "reset_parameters") and m.reset_parameters for m in torch_modules]
 
     try:
         for torch_module in torch_modules:
+            assert hasattr(torch_module, "reset_parameters")
             torch_module.reset_parameters = _no_op
-
         yield None
     finally:
         for torch_module, saved_function in zip(torch_modules, saved_functions, strict=True):
+            assert hasattr(torch_module, "reset_parameters")
             torch_module.reset_parameters = saved_function