Add t-hamano as codeowner for env package

[t-hamano]

What?

Added myself (t-hamano) as a codeowner for env package.

Why?

I do not fully understand the env package and may not be able to give a detailed review. However, it appears that many Windows OS-specific problems have occurred so far, especially in this package:

• env: Unable to boot on Windows OS #50814
• wp-env: Unable to upload plugins on Linux & Windows, error on media upload. #45592
• fix: xdebug unable to connect to host when running wp-env in windows … #31192
• wp-env: Remove platform-specific destroy commands #30638
• Failed to setup Gutenberg in both local wordpress or Docker - Windows 10 #23121

Therefore, I would like to receive a notification when a pull request is submitted for this package and see if the changes work properly on the Windows OS.

[github-actions]

Flaky tests detected in 8dcd65b.
Some tests passed with failed attempts. The failures may not be related to this commit but are still reported for visibility. See the documentation for more information.

🔍 Workflow run URL: https://github.com/WordPress/gutenberg/actions/runs/5032907790
📝 Reported issues:

• [Flaky Test] should allow to return Global Styles root when example is clicked #50799 in /test/e2e/specs/site-editor/style-book.spec.js
• [Flaky Test] should apply Heading block styles to all Heading blocks #49942 in /test/e2e/specs/site-editor/push-to-global-styles.spec.js
• [Flaky Test] should delete the template after saving the reverted template #50783 in /test/e2e/specs/site-editor/template-revert.spec.js
• [Flaky Test] should show the original content after revert #47897 in /test/e2e/specs/site-editor/template-revert.spec.js

[gziolo]

Excellent, thank you for volunteering 👍

[noahtallen]

Thanks a ton!