assert: add `expect()`

### What is the problem this feature will solve? `expect()` is a popular way of writing assertions. From what I've been able to tell, many developers prefer writing assertions in this style compared to the current assertion style provided by `node:assert`. Many batteries included test runners (Jest, Vitest, bun:test, etc.) expose this API. ### What is the feature you are proposing to solve the problem? `node:assert` exports the `expect()` API. ### What alternatives have you considered? Use the existing `node:assert` assertions or install `expect()` from npm.