refactor(theme): use namedExport of cssModules

[SoonIter]

Summary

WARNING: DANGEROUS PULL REQUSET

1. add namedExport: true for cssModules via test: add cssModules namedExport test case rslib#854

2. remove tons of unused className

Related Issue

web-infra-dev/rslib#854

#1967

Checklist

• Tests updated (or not required).
• Documentation updated (or not required).

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