feat/project structure

[Taehoya]

Description

• add handler package
• add mock pkg
• add db addr function
• update repositores package structure
• remove controller package
• remove unncessary file and update user entitiy
• install validator package
• add test ci pipeline
• update main.go with handler package
• update usecase pkg
• update test sql file
• resolve test fail
• add migrate tool

Tests

• N/A

Demo

• N/A