feat(core): simplify config option of createRsbuild

[chenjiahan]

Summary

I originally named the configuration option for createRsbuild as rsbuildConfig to make it clear that it was specific to Rsbuild (and not Rspack or other tools).

Over time, though, I realized the name is unnecessarily long—especially in e2e tests where I have to type rsbuildConfig repeatedly.

This PR shortens it to config for simplicity. The old rsbuildConfig name will still work for now but is planned for deprecation in the future.

Checklist

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

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[Copilot]

Pull Request Overview

This PR simplifies the configuration option name for createRsbuild by introducing config as a more concise alternative to the existing rsbuildConfig option. The change maintains backward compatibility by keeping both options available, with rsbuildConfig marked for future deprecation.

• Adds a new config option to CreateRsbuildOptions interface
• Updates the internal implementation to prefer config over rsbuildConfig using nullish coalescing
• Updates CLI initialization to use the new config option

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
packages/core/src/types/rsbuild.ts	Adds the new config option and marks rsbuildConfig as deprecated
packages/core/src/createRsbuild.ts	Updates implementation to support both options with preference for config
packages/core/src/cli/init.ts	Updates CLI to use the new config option

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