feat: add domain, URL and email validators

[seladb]

Added new validators: DomainNameValidator, URLValidator, and EmailValidator heavily inspired by the corresponding Django validators

Description

Added three new validator classes:

1. DomainNameValidator - Validates domain names according to RFC 1034 and RFC 1123
   • Supports internationalized domain names (IDN) via accept_idna parameter
   • Includes InvalidDomainName exception class
2. URLValidator - Validates URLs according to RFC 3986
   • Supports IPv4, IPv6 addresses, ports, and various schemes (http, https, ftp, ftps)
   • Includes InvalidURL and InvalidScheme exception classes
3. EmailValidator - Validates email addresses according to RFC 3696
   • Validates both local part and domain part
   • Supports domain allowlisting via allowed_domains parameter
   • Supports literal IPv4/IPv6 addresses in domain
   • Includes InvalidEmailAddress exception class

Also added:

• Pre-configured validator instances: validate_domain_name, validate_url, validate_email
• Comprehensive tests

Motivation and Context

Provides built-in validators for common validation patterns (domain names, URLs, email addresses) that can be used in tortoise-orm field validators.

Also in par with Django validators.

How Has This Been Tested?

• Added new test cases unser pytest tests/test_validators.py covering valid and invalid inputs for all three validators

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added the changelog accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

[codspeed-hq]

Merging this PR will not alter performance

✅ 24 untouched benchmarks

---

_{Comparing seladb:add-validators (033ce38) with develop (2df46d0)}

[seladb]

@abondar MSSQL tests are failing again 😕
Can we disable the failing tests for now so we merge PRs that are not related?
Or maybe give me permissions to re-run the failing tests?

[seladb]

Also @abondar @long2ice I have 5 PRs ready for review, some of them are ready for quite some time. Do you accept PRs in this project and are available to review them? If yes, I'd really appreciate if you can review.

I really like this project and would love to contribute more! ❤️

[seladb]

@abondar MSSQL tests are failing again 😕 Can we disable the failing tests for now so we merge PRs that are not related? Or maybe give me permissions to re-run the failing tests?

@abondar I think I found the bug! I created a PR with a fix here: #2169