Add Node Rendition HLAPIs (Experimental)

[vamshich13]

Summary

This PR introduces the createRendition API, enabling add-ons to generate image renditions of visual nodes directly from the document sandbox.

Key Changes

New API Method

• VisualNode.createRendition(options?): Added to VisualNode and inherited by all visual node subclasses (e.g., ArtboardNode, GroupNode, RectangleNode, TextNode). This asynchronous method generates a rendition of the node and its descendants.

New Interfaces & Enumerations

• CreateRenditionOptions: Interface defining configuration options for generating renditions.
• CreateRenditionResult: Interface defining the structure of the returned rendition data (e.g., blob, metadata).
• CreateRenditionFormat: New enumeration in Constants namespace specifying supported output formats (e.g., PNG, JPEG, PDF).

Documentation Updates

• Updated 40+ class files (including ArtboardNode, GroupNode, RectangleNode, TextNode, etc.) to reflect the new createRendition method availability.
• Updated overview.md to include references to the new interfaces and enumeration.

Related Issue

Motivation and Context

How Has This Been Tested?

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• I have signed the Adobe Open Source CLA.
• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.