fix: avoid multiple webpack instance

[ahabhgk]

Types of changes

• New feature
• Bug fix
• Documentation change
• Coding style change
• Refactoring
• Performance improvement
• Test cases
• Continuous integration
• Typescript definition change
• Breaking change

Background and context

Solution

require("webpack") is a common misuses in webpack plugin, which will cause multiple webpack instance problem in monorepo, the correct way to get the webpack instance is compiler.webpack

How is the change tested?

Changelog

Changelog(CN)	Changelog(EN)	Related issues

Checklist:

• Provide changelog for relevant changes (e.g. bug fixes and new features) if applicable.
• Changes are submitted to the appropriate branch (e.g. features should be submitted to feature branch and others should be submitted to master branch)

Other information