Easy and consistent API for emailPassword methods

[kneth]

As reported in #3723, the API of Realm.Auth.EmailPasswordAuth.resetPassword() is not consistent between Realm Web and Realm JavaScript. Moreover, the TypeScript definition says on thing, and the API documentation says something else. The root cause is positional arguments (all strings) which is error prone for both our users and for ourself.

We should deprecate all current methods of Realm.Auth.EmailPasswordAuth (to be removed in version 11) and implement a new variant of the API:

callResetPasswordFunction({ email: string, password: string }, args: [BSON])
confirmUser({ token: string, id: string })
registerUser({ email: string, password: string })
resendConfirmationEmail({ email: string }) // for consistency
resetPassword({ password: string, token: string, id: string })
sendResetPasswordEmail({ email: string }) // for consistency

Methods should log a warning if called with deprecated signature.