fix:Fixing webpack5 cache invalidation

[yicheny]

Currently, webpack5 caching is not working

If the cache was in effect, it would generate files with a '.pack' suffix, like ：

And now, the generated result looks like this：

The reason is that 'compiler.close()' is not called

webpack will generate the cache in 'compiler.close()'

Run 'npm run build' to verify the effect

has a huge impact on compilation speed in a project

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[yicheny]

Did not join CLA at that time, so close