Allow use theme colors in code blocks

[userquin]

Is your feature request related to a problem? Please describe.

Currently VitePress has only code blocks to be dark, and so it is "hard/too repetitive" for ppl to use light colors in ligth theme.

Describe the solution you'd like

Include code blocks variables and variants to allow use theme in the code blocks.

Describe alternatives you've considered

Add styles manually to each repo, for example:

• docs(fix): lang and copy in code blocks in light mode vitest-dev/vitest#1666
• docs(fix): lang and copy in code blocks in light mode vite-pwa/vite-plugin-pwa#341

Additional context

No response

Validations

• Follow our Code of Conduct
• Read the docs.
• Read the Contributing Guidelines.
• Check that there isn't already an issue that asks for the same feature to avoid creating a duplicate.

[didoee]

必须是英文的吗？

[userquin]

closing, fixed with #2319