Add JSON Schema Definition for gen_ai.tool.definitions

[Cirilla-zmh]

Fixes #2721 #1835

Changes

Add JSON schema definition for gen_ai.tool.definitions.

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Merge requirement checklist

• CONTRIBUTING.md guidelines followed.
• Change log entry added, according to the guidelines in When to add a changelog entry.
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[Cirilla-zmh]

This is the continued PR of #2793

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[github-actions]

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