Oudwins / zog / 19015784300

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feat: add IPv4 validator for strings (#192)

* feat: add IPv4 validator for strings

- Added IPv4() method to StringSchema in string.go
- Added ErrCodeIPv4 constant in zconst/zconst.go
- Added default error message in i18n/en/en.go
- Added comprehensive tests in string_validate_test.go and string_test.go
- Updated documentation in docs/reference.md

The validator uses net.ParseIP() and To4() to ensure the address
is a valid IPv4 format and not IPv6.

* feat: add IPv4 method to NotStringSchema interface

* feat(i18n): add error message for invalid IPv4 address

* refactor(i18n): remove IPv4 message from language map

Co-authored-by: Tristan M. <54208010+Oudwins@users.noreply.github.com>

* refactor: remove IPv4 method from NotStringSchema interface

Co-authored-by: Tristan M. <54208010+Oudwins@users.noreply.github.com>

* refactor: update IPv4 references to a more generic IP format in error messages and validation

* fix: improve IPv4 validation to check for colon characters

Co-authored-by: Tristan M. <54208010+Oudwins@users.noreply.github.com>

* test: add regression tests for IPv6-mapped IPv4 addresses

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Co-authored-by: Tristan M. <54208010+Oudwins@users.noreply.github.com>

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