[Refactor] [2/N] Move tool parsers into the vLLM main directory

[chaunceyjiang]

Purpose

Test Plan

vllm serve /home/jovyan/qwen3-8b --enable-auto-tool-choice  --tool-call-parser hermes --reasoning-parser qwen3   
...
(APIServer pid=95682) INFO 12-15 08:10:07 [launcher.py:46] Route: /v1/score, Methods: POST
(APIServer pid=95682) INFO 12-15 08:10:07 [launcher.py:46] Route: /rerank, Methods: POST
(APIServer pid=95682) INFO 12-15 08:10:07 [launcher.py:46] Route: /v1/rerank, Methods: POST
(APIServer pid=95682) INFO 12-15 08:10:07 [launcher.py:46] Route: /v2/rerank, Methods: POST
(APIServer pid=95682) INFO 12-15 08:10:07 [launcher.py:46] Route: /pooling, Methods: POST
(APIServer pid=95682) INFO:     Started server process [95682]
(APIServer pid=95682) INFO:     Waiting for application startup.
(APIServer pid=95682) INFO:     Application startup complet

╰─➤  python
Python 3.12.11 | packaged by conda-forge | (main, Jun  4 2025, 14:45:31) [GCC 13.3.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
Ctrl click to launch VS Code Native REPL
>>> from vllm.entrypoints.openai.tool_parsers import ToolParser
<stdin>:1: DeprecationWarning: `vllm.entrypoints.openai.tool_parsers.ToolParser` has been moved to `vllm.tool_parsers.ToolParser`. The old name will be removed in v0.14.
>>> 

Test Result

---

Essential Elements of an Effective PR Description Checklist

• The purpose of the PR, such as "Fix some issue (link existing issues this PR will resolve)".
• The test plan, such as providing test command.
• The test results, such as pasting the results comparison before and after, or e2e results
• (Optional) The necessary documentation update, such as updating supported_models.md and examples for a new model.
• (Optional) Release notes update. If your change is user facing, please update the release notes draft in the Google Doc.

[mergify]

Documentation preview: https://vllm--30675.org.readthedocs.build/en/30675/

[gemini-code-assist]

Code Review

This pull request is a refactoring that moves the tool parsers from vllm/entrypoints/openai/tool_parsers to a new top-level directory vllm/tool_parsers. The changes consist of moving files and updating all relevant import paths. I have reviewed the changes and they appear to be correct and complete within the scope of this PR. The refactoring is well-executed and I have no further comments.

[chatgpt-codex-connector]

Codex usage limits have been reached for code reviews. Please check with the admins of this repo to increase the limits by adding credits.

[DarkLight1337]

Thanks for the cleanup!