feat(nodes): add invocation schema customisation, add model selection

- add invocation schema customisation

done via fastapi's `Config` class and `schema_extra`. when using `Config`, inherit from `InvocationConfig` to get type hints.

where it makes sense - like for all math invocations - define a `MathInvocationConfig` class and have all invocations inherit from it.

this customisation can provide any arbitrary additional data to the UI. currently it provides tags and field type hints.

this is necessary for `model` type fields, which are actually string fields. without something like this, we can't reliably differentiate  `model` fields from normal `string` fields.

can also be used for future field types.

all invocations now have tags, and all `model` fields have ui type hints.

- fix model handling for invocations

added a helper to fall back to the default model if an invalid model name is chosen. model names in graphs now work.

- fix latents progress callback

noticed this wasn't correct while working on everything else.

invokeai/app/invocations/math.py

@@ -1,17 +1,26 @@
 # Copyright (c) 2023 Kyle Schouviller (https://github.com/kyle0654)
 
-from datetime import datetime, timezone
-from typing import Literal, Optional
+from typing import Literal
 
-import numpy
-from PIL import Image, ImageFilter, ImageOps
 from pydantic import BaseModel, Field
 
-from ..services.image_storage import ImageType
-from ..services.invocation_services import InvocationServices
+from invokeai.app.invocations.models.config import InvocationConfig
+
 from .baseinvocation import BaseInvocation, BaseInvocationOutput, InvocationContext
 
 
+class MathInvocationConfig(BaseModel):
+    """Helper class to provide all math invocations with additional config"""
+
+    # Schema customisation
+    class Config(InvocationConfig):
+        schema_extra = {
+            "ui": {
+                "tags": ["math"],
+            }
+        }
+
+
 class IntOutput(BaseInvocationOutput):
     """An integer output"""
     #fmt: off
@@ -20,7 +29,7 @@ class IntOutput(BaseInvocationOutput):
     #fmt: on
 
 
-class AddInvocation(BaseInvocation):
+class AddInvocation(BaseInvocation, MathInvocationConfig):
     """Adds two numbers"""
     #fmt: off
     type: Literal["add"] = "add"
@@ -32,7 +41,7 @@ class AddInvocation(BaseInvocation):
         return IntOutput(a=self.a + self.b)
 
 
-class SubtractInvocation(BaseInvocation):
+class SubtractInvocation(BaseInvocation, MathInvocationConfig):
     """Subtracts two numbers"""
     #fmt: off
     type: Literal["sub"] = "sub"
@@ -44,7 +53,7 @@ class SubtractInvocation(BaseInvocation):
         return IntOutput(a=self.a - self.b)
 
 
-class MultiplyInvocation(BaseInvocation):
+class MultiplyInvocation(BaseInvocation, MathInvocationConfig):
     """Multiplies two numbers"""
     #fmt: off
     type: Literal["mul"] = "mul"
@@ -56,7 +65,7 @@ class MultiplyInvocation(BaseInvocation):
         return IntOutput(a=self.a * self.b)
 
 
-class DivideInvocation(BaseInvocation):
+class DivideInvocation(BaseInvocation, MathInvocationConfig):
     """Divides two numbers"""
     #fmt: off
     type: Literal["div"] = "div"