Issue #3584010: Add FilterableRagTool with per-index derivatives and attribute filtering

m4oliveirequested to merge
issue/ai_search-3584010:3584010-add-filterableragtool into 2.0.x

Adds a new deriver-based FunctionCall plugin that produces one derivative per ai_search.index.* config. Each derivative is scoped to a single Search API index and exposes attribute fields as optional context_definitions, allowing LLMs to pass filter values as query conditions. The existing RagTool remains untouched for backwards compatibility.

Co-Authored-By: Claude Opus 4.6 (1M context) noreply@anthropic.com

Closes #3584010

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