feat: expose logger in plugin API

[chenjiahan]

Summary

While we already export the logger from @rsbuild/core, providing the api.logger will make it easier and more intuitive for plugin authors (and AI) to use the logger.

Checklist

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

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[Copilot]

Pull Request Overview

This PR exposes a unified logger instance on the plugin API, making it easier for plugin authors to log messages consistently.

• Add logger: Logger to the RsbuildPluginAPI type and initialization logic
• Update core exports to include the Logger type and logger instance
• Document api.logger in both plugin and core API guides, and add an e2e test for the new API

Reviewed Changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated 6 comments.

Show a summary per file

File	Description
website/docs/zh/plugins/dev/core.mdx	Document api.logger usage in Chinese plugin development guide
website/docs/zh/api/javascript-api/core.mdx	Clarify logger description in Chinese core API reference
website/docs/en/plugins/dev/core.mdx	Document api.logger usage in English plugin development guide
website/docs/en/api/javascript-api/core.mdx	Clarify logger description in English core API reference
packages/core/src/types/plugin.ts	Add logger: Logger to RsbuildPluginAPI
packages/core/src/initPlugins.ts	Expose logger on the built plugin API object
packages/core/src/index.ts	Export Logger type alongside logger
e2e/cases/plugin-api/logger/src/index.js	Scaffold plugin entry file for e2e test
e2e/cases/plugin-api/logger/index.test.ts	Add e2e test verifying api.logger

Comments suppressed due to low confidence (1)

e2e/cases/plugin-api/logger/index.test.ts:5

• [nitpick] The test description mentions "custom resolver" but this case is about the logger API—consider renaming it to something like "should expose logger in plugin API".

test('should allow plugin to custom resolver', async () => {