Move all composer files inside the common directory

- 2022년 3월 개발팀 결정사항 적용
- 모듈 등 서드파티 자료 개발시 composer를 사용하면 상위 경로에 있는 코어의
  composer.json을 수정하고, 코어의 vendor 디렉토리를 건드리는 것이 기본값임
- 이를 방지하기 위해 코어의 composer.json과 vendor를 common 디렉토리 안으로
  이동하여, 모듈 경로에서 상위 폴더로 인식하지 않도록 함

common/vendor/egulias/email-validator/CHANGELOG.md

@@ -0,0 +1,33 @@
+# EmailValidator v3 Changelog
+
+## New Features
+
+* Access to local part and domain part from EmailParser
+* Validations outside of the scope of the RFC will be considered "extra" validations, thus opening the door for adding new; will live in their own folder "extra" (as requested in #248, #195, #183). 
+
+## Breacking changes
+
+* PHP version upgraded to match Symfony's (as of 12/2020).
+* DNSCheckValidation now fails for missing MX records. While the RFC argues that the existence of only A records to be valid, starting in v3 they will be considered invalid.
+* Emails domain part are now intenteded to be RFC 1035 compliant, rendering previous valid emails (e.g example@examp&) invalid.
+
+## PHP versions upgrade policy
+PHP version upgrade requirement will happen via MINOR (3.x) version upgrades of the library, following the adoption level by major frameworks.
+
+## Changes
+* #235
+* #215
+* #130
+* #258
+* #188
+* #181
+* #217
+* #214
+* #249
+* #236
+* #257
+* #210
+
+## Thanks
+To contributors, be it with PRs, reporting issues or supporting otherwise.
+