Fix broken json schema option

[Pr3roxDLC]

Mistral expects a json object for the schema field but was provided a string encoding the json object.
Fixed by telling jackson to treat the string as raw json

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Important

Fixes JSON schema handling in JsonSchema by adding @JsonRawValue to treat schema as raw JSON.

• Behavior:
  • Fixes JSON schema handling in JsonSchema class by adding @JsonRawValue to schema field.
  • Ensures schema is treated as raw JSON, aligning with Mistral's expectations.
• Annotations:
  • Adds @JsonRawValue to schema field in JsonSchema class.

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[ellipsis-dev]

Important

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1. src/main/java/nl/dannyj/mistral/models/completion/tool/JsonSchema.java:64

• Draft comment:
  Using @JsonRawValue here is a valid fix to emit the JSON schema as raw JSON. Ensure that the content of 'schema' is always valid JSON to avoid runtime serialization issues.
• Reason this comment was not posted:
  Confidence changes required: 0% <= threshold 50% None

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[Dannyj1]

Thank you for submitting this PR! This was indeed an oversight introduced in version 2.0 that I didn't catch during testing.

Merging this now. I'll publish a new release in the next few days.

Thanks again for your contribution!