[Core] xgrammar: Expand list of unsupported jsonschema keywords

[russellb]

While doing some testing with xgrammar, I ran into an supported
attribute for a string type. I checked the code and found some things
we weren't checking for.

Details can be found by searching for warnUnsupportedKeywords in
this file:

https://github.com/mlc-ai/xgrammar/blob/main/cpp/json_schema_converter.cc

Signed-off-by: Russell Bryant [email protected]

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[aarnphm]

I think the xgrammar team will have this support soon, but we should def get this in for now

@russellb probably we should want to add a note to to remove it once it is supported upstream

[mgoin]

Would be good to add a json schema test case for this so we know we won't regress in the future

[russellb]

Would be good to add a json schema test case for this so we know we won't regress in the future

I'll look at this for V1 CI coverage at least