Model Merge depends on InvokeAI

[iwr-redmond]

src/invoke_training/model_merge/scripts/merge_lora_into_model.py L10:

# HACK(ryand): Import order matters, because invokeai contains circular imports.
from invokeai.backend.model_manager import BaseModelType
from invokeai.backend.lora import LoRAModelRaw
from invokeai.backend.model_patcher import ModelPatcher

But the documentation draft (docs/get-started/installation.md) says:

Create and activate a python virtual environment. This creates an isolated environment for invoke-training and its dependencies that won't interfere with other python environments on your system, including any installations of InvokeAI.

And presently invokeai is not listed in pyproject.toml as a dependency.

[RyanJDick]

invokeai is listed in pyproject.toml:

invoke-training/pyproject.toml

Line 24 in e4c2fc8

"invokeai==4.2.3",

I want to get rid of this dependency at some point. It doesn't make sense to install all of invokeai just for the few files that we want. But, for now, it should work as-is.