[FR] Support generateVerifyAndChangeEmailLink #1149

Is your feature request related to a problem? Please describe.

I have a Spring Boot application for which I use Firebase Admin SDK installed from Maven, version 9.7.0.

As I'd like to send to my users custom email templates regarding email confirmation, password reset and others. To do that I have to use link generation methods that SDK provides and then include that link in custom templates.

I noticed, that latest version of SDK does not support generating email links for changing user e-mail address
i.e. generateVerifyAndChangeEmailLink, that seems to be already supported for example in Node SDK.

Supported link types in SDK as of now:

 static enum EmailLinkType {
        VERIFY_EMAIL,
        EMAIL_SIGNIN,
        PASSWORD_RESET;
 }

I believe VERIFY_AND_CHANGE_EMAIL also might be useful alongside with supporting methods.

Describe the solution you'd like
Add support for generateVerifyAndChangeEmailLink with VERIFY_AND_CHANGE_EMAIL.

Describe alternatives you've considered
I believe as an alternative it might be possible to create API calls from scratch though I believe having dedicated methods is better and easier for developers.