feat: add topology spread constraints for gateway and controller

[wilsonwu]

Ⅰ. Describe what this PR did

Ⅱ. Does this pull request fix one issue?

Ⅲ. Why don't you add test cases (unit test/integration test)?

Ⅳ. Describe how to verify it

Ⅴ. Special notes for reviews

Ⅵ. AI Coding Tool Usage Checklist (if applicable)

Please check all applicable items:

• For new standalone features (e.g., new wasm plugin or golang-filter plugin):

  • I have created a design/ directory in the plugin folder
  • I have added the design document to the design/ directory
  • I have included the AI Coding summary below

• For regular updates/changes (not new plugins):

  • I have provided the prompts/instructions I gave to the AI Coding tool below
  • I have included the AI Coding summary below

AI Coding Prompts (for regular updates)

AI Coding Summary

[johnlanni]

LGTM

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 46.86%. Comparing base (985b58a) to head (cc139f9).
⚠️ Report is 42 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3171   +/-   ##
=======================================
  Coverage   46.86%   46.86%           
=======================================
  Files          87       87           
  Lines       12922    12922           
=======================================
  Hits         6056     6056           
  Misses       6477     6477           
  Partials      389      389           

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.