feat: support dynamic entry

[SyMind]

Summary

/** @type {import("@rspack/core").Configuration} */
module.exports = {
	entry() {
		return Promise.resolve({
			a: "./a",
			b: ["./b"]
		});
	},
};

Checklist

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

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[ahabhgk]

Need update zod.ts and export DynamicEntryPlugin from exports.ts

[ahabhgk]

Also add docs for DynamicEntryPlugin