[Feature]: Support for Deferring Module Evaluation (`import defer`)

[chenjiahan]

What problem does this feature solve?

Add support for deferring module evaluation (import defer):

import defer * as yNamespace from "y";

What does the proposed API of configuration look like?

Ref:

• Proposal: https://github.com/tc39/proposal-defer-import-eval
• webpack PR (merged): [experiment] implement tc39 Defer Module Evaluation webpack/webpack#16567
• Rollup: Import defer support rollup/rollup#5932
• TypeScript (merged): Add support for import defer proposal microsoft/TypeScript#60757