Tidy names and locations of modules

- Rename old "model_management" directory to "model_management_OLD" in order to catch
  dangling references to original model manager.
- Caught and fixed most dangling references (still checking)
- Rename lora, textual_inversion and model_patcher modules
- Introduce a RawModel base class to simplfy the Union returned by the
  model loaders.
- Tidy up the model manager 2-related tests. Add useful fixtures, and
  a finalizer to the queue and installer fixtures that will stop the
  services and release threads.

invokeai/backend/model_manager/probe.py

@@ -8,9 +8,7 @@ import torch
 from picklescan.scanner import scan_file_path
 
 import invokeai.backend.util.logging as logger
-from invokeai.backend.model_management.models.base import read_checkpoint_meta
-from invokeai.backend.model_management.models.ip_adapter import IPAdapterModelFormat
-from invokeai.backend.model_management.util import lora_token_vector_length
+from .util.model_util import lora_token_vector_length, read_checkpoint_meta
 from invokeai.backend.util.util import SilenceWarnings
 
 from .config import (
@@ -55,7 +53,6 @@ LEGACY_CONFIGS: Dict[BaseModelType, Dict[ModelVariantType, Union[str, Dict[Sched
     },
 }
 
-
 class ProbeBase(object):
     """Base class for probes."""
 
@@ -653,8 +650,8 @@ class LoRAFolderProbe(FolderProbeBase):
 
 
 class IPAdapterFolderProbe(FolderProbeBase):
-    def get_format(self) -> IPAdapterModelFormat:
-        return IPAdapterModelFormat.InvokeAI.value
+    def get_format(self) -> ModelFormat:
+        return ModelFormat.InvokeAI
 
     def get_base_type(self) -> BaseModelType:
         model_file = self.model_path / "ip_adapter.bin"