Add support for new identity field for email verifications

[jimmyjames]

Description

Adds support for specifying the (optional) identity object when creating email verification tickets or jobs. This is needed when verifying emails when the primary is social, enterprise, or passwordless. Also needed to verify secondary identities.

References

• https://auth0.com/docs/api/management/v2#!/Tickets/post_email_verification
• https://auth0.com/docs/api/management/v2#!/Jobs/post_verification_email

Testing

Unit tests added, and verified manually with a real tenant and users.

• This change adds test coverage for new/changed/fixed functionality

Checklist

• I have added documentation for new/changed functionality in this PR or in auth0.com/docs
• All active GitHub checks for tests, formatting, and security are passing
• The correct base branch is being used, if not master

[github-actions]

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