refactor: add JSDoc to improve Rspack configuration.entry|context|mode types

[GiveMe-A-Name]

…context] types.

Zod types system is not easy to understand by user.

We tend use raw ts provider intellisense and jsDoc for user in ide.

• Add type & JSDoc for config.entry
• Add type & JSDoc for config.context
• Add type & JSDoc for config.dependencies
• Add type & JSDoc for config.mode

See https://github.com/web-infra-dev/rspack/issues/4241 more detail.

Summary

Checklist

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

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