Add polygon fill color gradient

[asd123a20]

Description

Add polygon fill color gradient

Motivation and Context

The single color of the filling material cannot meet the requirements

How Has This Been Tested?

Add attribute colorList. If colorListexist, perform a gradient for colorList. Otherwise, use color

Screenshots (if appropriate):

Types of Changes

• Bug fix (non-breaking change that fixes an issue)
• New feature (non-breaking change that adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation Update
• Tests
• Other (Tooling, Dependency Updates, etc.)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I added a new test.

If you added a new component feature (layer, geom, source, etc.), please be sure to update the documentation:

• Add component to output.globals in vite.config.ts
• Provide at least one simple snapshot test (see test directory)
• Create a src/demos/<Component>Demo.vue
• Create a docs/componentsguide/<Category>/<Feature>/index.md containing the Demo and documentation for the component
• Add the docs page to docs/.vitepress/config.ts

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[d-koppenhagen]

Can you please change the issue and description into English language?