feat: added jest expect support

[sheremet-va]

with this libraries (like #60) can use vitest with jest's extend

[sheremet-va]

I've removed expect, but it didn't change lockfile much, because jest-snapshot uses it 😞

They also are using a lot of jest packages!

  expect: 27.4.2
  jest-diff: 27.4.2
  jest-get-type: 27.4.0
  jest-haste-map: 27.4.2
  jest-matcher-utils: 27.4.2
  jest-message-util: 27.4.2
  jest-resolve: 27.4.2
  jest-util: 27.4.2

[antfu]

Then how about we just use expect instead of chai? 😅

As discussed, we decided to not depend on jest-* for better optimization and integration, while trying to make it compatible for users to migrate.

[sheremet-va]

I need a review ⭐

[antfu]

Looks awesome, thanks a lot!