feat(core): add ToonUtils for JSON to TOON format conversion and update FlowAiCopilot to use it

[iitzIrFan]

✨ Description

feat(ai): implement TOON format for JSON Schema optimization

• Add ToonUtils utility class for JSON to TOON conversion
• Integrate TOON conversion in FlowAiCopilot for LLM requests
• Update FlowYamlBuilder system prompt to indicate TOON format
• Add comprehensive unit tests (19 tests, all passing)

TOON (Token-Oriented Object Notation) reduces JSON Schema
size by 30-40%, improving LLM response times and reducing token costs.

Implements TOON 2.0 spec with support for:

• Indentation-based structure
• Inline primitive arrays
• Tabular uniform object arrays
• List-based nested arrays

🔗 Related Issue

Closes: #12433

🛠️ Backend Checklist

• Code compiles successfully and passes all checks
• All unit and integration tests pass
• New unit tests added for ToonUtils and pass (ToonUtilsTest.java)
• No performance regressions introduced (validate locally and rely on CI)

📝 Additional Notes

Implements TOON encoder to send JSON Schema to the AI Copilot in a compact, indentation-based format to reduce token usage and speed up LLM responses. Integrates ToonUtils.jsonToToon() into the AI flow generation.

• ToonUtils.java — new TOON encoder
• FlowAiCopilot.java — uses TOON instead of JSON
• FlowYamlBuilder.java — system prompt updated to indicate TOON format
• ToonUtilsTest.java — comprehensive tests (19 tests)

Testing notes (Windows):

• .\gradlew :core:test --tests ToonUtilsTest :webserver:compileJava

[iitzIrFan]

Any update on this PR? @MilosPaunovic @brian-mulier-p

[brian-mulier-p]

I'm too busy to properly test this PR rn so it will have to wait a bit sorry

[iitzIrFan]

No issues at all, @brian-mulier-p, please take your time reviewing the PR. I also wanted to highlight that, I have added tests for the Toon Utility, which should make the review smoother.

Thanks for your response!

[MilosPaunovic]

@brian-mulier-p This also needs your eyes, when you get the chance. 🙏🏻

[brian-mulier-p]

• you forgot to update FlowAiCopilot to use it

[iitzIrFan]

Will update!

[iitzIrFan]

@brian-mulier-p , I have updated FlowAiCopilot to use the TOON Utility and made the necessary test updates. The changes are ready for review.