Add Points Editor and other quality of life parameter widget extension inputters for custom workflows

[Glidias]

I've just set up a draft/feature branch: main...Glidias:krita-ai-diffusion:feature/qol_param_extensions#diff-0852b89d5f21ca3a3b940194e0bdfb1aee7d0b3ef7de51b86cc6e1f6722e4058 for a Points Editor UI in Krita and other registerable menu parameter widget extensions. I am currently using it for ComfyUI API SAM2 workflow (or similar ones) to help specify the SAM2 coordinates in JSON text format.
Workflow: Glidias/mask2sam#5

Usage UI:
https://github.com/Glidias/krita-ai-diffusion/wiki/Feature:-Points-Editor-Widget

any other ideas? Widget menu parameter widget extension list to help user enter:

• Random seed (integer)
• Current playback head frame index (in Krita)
• Color selector popup dialog result to Integer.
• Current Krita document file name
• File selector popup dialog result etc.
• Currently active mask layer
• Currently active paint layer

Currently registered widget extension features: https://github.com/Glidias/krita-ai-diffusion/blob/feature/qol_param_extensions/ai_diffusion/ui/register_extensions.py

[Glidias]

My approach for Integer/Float parameter preview color swatches is to decouple the previewed value widget used, if any, (infered based off minimum/maximum numeric values set in workflow parameters), with the flexibility of all usable QOL widgets able to set values (based off parameter data type only in workflow). Example as below:

Grayscale color Swatch:

• For float parameter values, if the minimum workflow parameter constraint value is zero and the maximum value is 1, will show a tiny read-only grayscale swatch preview on the right of input field to represent the current value (white is highest, black is lowest).
• Or for int value if the minimum workflow parameter constraint value is zero and the maximum value is 255, will show similar grayscale swatch preview.

As in the above cases, whether the parameter is actually used to represent grayscale color values or not in the workflow is irrelevant so long as the minimum/maximum constraints matches the specific "pattern".

RGB Color swatch:

• For integer parameter values if minimum value is zero and the maximum value 16777215 , will show a colored swatch preview instead.

RGBA Color Swatch

• For integer parameter values if minimum value is zero and the maximum value 4294967295 , will show a colored swatch preview instead but with alpha checkerboard background representing how much alpha transparency is used.

As in the above cases, whether the parameter is actually used to represent RGB/RGBA color values or not in the workflow is irrelevant so long as the minimum/maximum constraints matches the specific "pattern".