feat(nodes): refactor parameter/primitive nodes

Refine concept of "parameter" nodes to "primitives":
- integer
- float
- string
- boolean
- image
- latents
- conditioning
- color

Each primitive has:
- A field definition, if it is not already python primitive value. The field is how this primitive value is passed between nodes. Collections are lists of the field in node definitions. ex: `ImageField` & `list[ImageField]`
- A single output class. ex: `ImageOutput`
- A collection output class. ex: `ImageCollectionOutput`
- A node, which functions to load or pass on the primitive value. ex: `ImageInvocation` (in this case, `ImageInvocation` replaces `LoadImage`)

Plus a number of related changes:
- Reorganize these into `primitives.py`
- Update all nodes and logic to use primitives
- Consolidate "prompt" outputs into "string" & "mask" into "image" (there's no reason for these to be different, the function identically)
- Update default graphs & tests
- Regen frontend types & minor frontend tidy related to changes

tests/nodes/test_node_graph.py

@@ -19,7 +19,7 @@ from invokeai.app.services.graph import (
 from invokeai.app.invocations.upscale import ESRGANInvocation
 from invokeai.app.invocations.image import *
 from invokeai.app.invocations.math import AddInvocation, SubtractInvocation
-from invokeai.app.invocations.params import ParamIntInvocation
+from invokeai.app.invocations.primitives import IntegerInvocation
 from invokeai.app.services.default_graphs import create_text_to_image
 import pytest
 
@@ -499,8 +499,8 @@ def test_graph_subgraph_t2i():
 
     g.add_node(n1)
 
-    n2 = ParamIntInvocation(id="2", a=512)
-    n3 = ParamIntInvocation(id="3", a=256)
+    n2 = IntegerInvocation(id="2", a=512)
+    n3 = IntegerInvocation(id="3", a=256)
 
     g.add_node(n2)
     g.add_node(n3)