[DO NOT MERGE] Add standalone MCP tool text2sql for load test and potential memory leak investigation

[yczhang-nv]

Description

The goal of this PR:

Analysis of Datadog logs for the ttysc MCP server revealed that the text2sql tool is the only component with a potential memory leak during observed incidents. To isolate this issue, a standalone version of the text2sql tool was developed. This standalone version minimizes external dependencies, retaining only vanna and milvus to preserve core logic.

By Submitting this PR I confirm:

• I am familiar with the Contributing Guidelines.
• We require that all contributors "sign-off" on their commits. This certifies that the contribution is your original work, or you have rights to submit it under the same license, or a compatible license.
  • Any contribution which contains commits that are not Signed-Off will not be accepted.
• When the PR is ready for review, new or existing tests cover these changes.
• When the PR is ready for review, the documentation is up to date with these changes.

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