Add parameter `embeddedBy` field to support vector embedding & semantic
search.
Major change in `internal/util/parameters/parameters.go`
This PR only adds vector formatter for the postgressql tool. Other tools
requiring vector formatting may not work with embeddedBy.
Second part of the Semantic Search support. First part:
https://github.com/googleapis/genai-toolbox/pull/2121
Adds the following tools for Postgres:
(1) list_stored_procedure: Retrieves stored procedure metadata returning
schema name, procedure name, procedure owner, language, definition, and
description, filtered by optional role name (procedure owner), schema
name, and limit (default 20).
<img width="3808" height="1181" alt="image"
src="https://github.com/user-attachments/assets/43513a04-95ce-478f-a59f-3e5dafdb6b23"
/>
<img width="2654" height="1288" alt="image"
src="https://github.com/user-attachments/assets/84aca162-3779-4daa-ae2f-61620560589f"
/>
> Should include a concise description of the changes (bug or feature),
it's
> impact, along with a summary of the solution
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🛠️Fixes#1738
