feat: authentication system - mongo storage

[yk-eukarya]

• Change auth storage into mongo db
• Some refactoring on structure level

[codecov]

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[rot1024]

As a matter of fact, I thought it would be better to pack the implementation of authentication in appauth package, because in DDD, authentication is a subdomain, not a core domain.

However, your implementation is fine. The package is well separated, so it is unlikely to be a stumbling block for future refactoring.

Requests:

• Please implement internal/infrastructure/memory/auth.go also.