Запрос на слияние 'feature/add-phone-validation' (#1) из feature/add-phone-validation в master

Запрос на слияние 'feature/add-phone-validation' (#1) из feature/add-phone-validation в master

test: add missing imports and fix SNILS test data

merge: resolve conflict with instructor branch

merge: resolve conflict with instructor branch

feat: add phone validation function

test: add missing imports and fix SNILS test data

merge: resolve conflict with instructor branch

merge: resolve conflict with instructor branch

feat: add phone validation function

feat add validate_snils

test: add missing imports and fix SNILS test data

merge: resolve conflict with instructor branch

merge: resolve conflict with instructor branch

feat: add phone validation function

feat add validate_snils

fix: fix validator

test: add tests

Create: new_file

Create: validator.py

update: contest-token.txt