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Support @ToolParam annotation in JSON schema generation

Support @ToolParam annotation in JSON schema generation: a task in LegoFlow-SWE (Harbor dataset). We annotate tool parameter fields with @ToolParam to convey metadata that should be reflected in the JSON schemas produced by the victools/jsonschema-generator…

The task

We annotate tool parameter fields with `@ToolParam` to convey metadata that should be reflected in the JSON schemas produced by the [victools/jsonschema-generator](https://github.com/victools/jsonschema-generator). The annotation has three attributes:

Part of Lego-X/LegoFlow-SWE.