feat: add environments as a filter of api.transform

[chenjiahan]

Summary

Add environments as a filter of api.transform, example:

import type { RsbuildPlugin } from '@rsbuild/core';

export const myPlugin: RsbuildPlugin = {
  name: 'my-plugin',
  setup(api) {
    api.transform({ test: /\.js$/, environments: ['web'] }, ({ code }) => {
      return {
        code: code.replace('hello', 'target is web'),
      };
    });
    api.transform({ test: /\.js$/, environments: ['node'] }, ({ code }) => {
      return {
        code: code.replace('hello', 'target is node'),
      };
    });
  },
};

Checklist

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

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