perf(build): merge stats.toJson calls

[chenjiahan]

Summary

Merge the stats.toJson() calls during the build to reduce the overhead slightly and allow reuse of assets info in the future.

Checklist

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

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[Copilot]

Pull Request Overview

This PR optimizes build performance by consolidating stats.toJson() calls to reduce overhead and enable future reuse of assets information. The changes refactor how webpack/rspack stats are processed during the build phase.

Key changes:

• Modified stats collection to include assets information in a single call
• Updated the file size plugin to use pre-computed stats instead of making separate calls
• Refactored stats options handling to conditionally include assets data based on build action

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
packages/core/src/types/rsbuild.ts	Added 'assets' to the RsbuildStatsItem type definition
packages/core/src/plugins/fileSize.ts	Updated to use pre-computed stats from context instead of making separate stats calls
packages/core/src/helpers/stats.ts	Refactored stats options to conditionally include assets data and extracted reusable options

Comments suppressed due to low confidence (1)

packages/core/src/helpers/stats.ts:1

• The reassignment pattern with object spread creates unnecessary overhead. Since the base object is the same, consider defining separate option objects for each condition or using Object.assign for better performance.

import { logger } from '../logger';

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