feat: expose context.action property

[chenjiahan]

Summary

Expose a new context.action property.

context.action is set when running CLI commands or calling Rsbuild instance methods:

• dev: will be set when running rsbuild dev or rsbuild.startDevServer()
• build: will be set when running rsbuild build or rsbuild.build()
• preview: will be set when running rsbuild preview or rsbuild.preview()

For example:

if (rsbuild.context.action === 'dev') {
  // do something
}

Checklist

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

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