Add collision tile information to korge fleks gradle plugin

[jobe-m]

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[augmentcode]

🤖 Augment PR Summary

Summary: This PR enhances the KoRGE Fleks Gradle exporter to include per-tile collision metadata when exporting LDtk level chunks.

Changes:

• Extends TileSetData to carry a per-tileset map of tile IDs to collision IDs.
• Parses an LDtk enum named collisionConfig and builds a collision-ID → shape/rect lookup table.
• Reads tileset enumTags to associate tiles with collision definitions.
• Encodes collision info into the exported tile int (using dedicated bit ranges) and emits collision shape data into common.json.
• Copies the collision-shapes tileset image into level_data/ to make collision shape graphics available at runtime.
• Tightens LDtk JSON parsing by turning several previously-optional fields into required definitions with explicit errors.

Technical Notes: Collision is represented as an 8-bit value in the tile encoding, while common.json carries the collision ID → (x,y) mapping for lookup.

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[augmentcode]

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