Add emoji string generator

[timdeschryver]

Example

z.string().emoji()

PR that added this feature

https://github.com/colinhacks/zod/pull/2045

[github-actions[bot]]

:tada: This issue has been resolved in version 2.0.0-beta.14 :tada:

The release is available on:

• npm package (@beta dist-tag)
• GitHub release

Your semantic-release bot :package::rocket: