Add Granite 4.2 thinking parser

[0x484558]

🛠 Summary

Implement and register Granite 4.2 thinking parsing with request-level thinking controls, and make the embedded Jinja tojson filter compatible with the official template,

🧪 Checklist

• Unit tests added.
• The documentation updated.
• Change follows security best practices.

[przepeck]

In OVMS we are using name reasoning_parser.
Additionally, please check MiniCPM5 reasoning parser for reference for qwen3-like reasoning parsers.

[0x484558]

I've changed the name.

[0x484558]

It's not qwen3-like reasoning parser, Granite 4.2 parser stays entirely within the original DeepSeek-R1/Nemotron lineage. I cannot subclass qwen3 because IBM parser has incompatible semantics, Nor does it need to cope with unstable garbage that Qwen models generate, which historically prompted Qwen3 reasoning parser to be special.