feat: Add `locale` param to send/resend invitation methods (#1460)

## Description

This PR adds node SDK support for the `locale` prop in
`sendInvitation()` and `resendInvitation()` user management methods.
This recently landed in the API
[here](https://github.com/workos/workos/pull/51040).

## Documentation

Docs are ready to go here: https://github.com/workos/workos/pull/51227