Sweep: Use Go's ParseAddress for email validation

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Description

This pull request introduces a new method for email validation using Go's net/mail package, specifically the ParseAddress function. It also adds flexibility in choosing the validation method for email fields in the Rules struct.

Summary

• Added a new function validateEmail in defaults/email.go to validate email addresses using mail.ParseAddress.
• Modified defaults/rules.go to include:
  • A new boolean flag UseRegexValidation to choose between regex-based validation and ParseAddress validation for emails.
  • A custom validation function option ValidationFunction for additional validation flexibility.
  • Updated the Errors method to support the new email validation logic and custom validation functions.
• These changes allow more robust and flexible validation configurations for user inputs, particularly email addresses.

Fixes #1.

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Rollback Files For Sweep

• [ ] Rollback changes to defaults/email.go
• [ ] Rollback changes to defaults/rules.go

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