support custom domain for generate fake email

[martinyonatann]

Background

Previously, fake emails were generated with a random domain. This update allows the user to specify a custom domain for the generated email, providing more flexibility for different testing or mock scenarios.

Summary

• Added support for custom domains when generating fake emails.
• Default behavior remains unchanged if no custom domain is specified.

Changes

• Introduced WithCustomDomain function to set a custom domain.
• Updated fake email generation logic to use the custom domain.

Impact

• Backward-compatible.
• No breaking changes.

[rubemlrm]

LGFM 👍