Add altitude attribute to Marker and Popup

[yangtanyu]

Hi,
I have added a new property to Marker and Popup that represents the height above the ground. This is very useful for rendering 3D models and marking objects with specific heights. I hope to contribute to the open-source community.

Please read the instructions and review the code, thanks！

Add additional detail and context in the PR description (with screenshots/videos if there are visual changes).
before:

after:

Manually test the debug page.
I used npm run start debug and added a markers-altitude.html debugging page

Write tests for all new functionality and make sure the CI checks pass.
I used npm run test and it passed the test

Document any changes to public APIs.
/src/ui/marker.ts -> line:58
/src/ui/popup.ts -> line:80

this PR includes style spec API or visual changes.
@mapbox/static-apis @mapbox/map-design-team

Launch Checklist

• Make sure the PR title is descriptive and preferably reflects the change from the user's perspective.
• Add additional detail and context in the PR description (with screenshots/videos if there are visual changes).
• Manually test the debug page.
• Write tests for all new functionality and make sure the CI checks pass.
• Document any changes to public APIs.
• Post benchmark scores if the change could affect performance.
• Tag @mapbox/map-design-team @mapbox/static-apis if this PR includes style spec API or visual changes.
• Tag @mapbox/gl-native if this PR includes shader changes or needs a native port.