V2 alpha - initial version (#172)

Initial alpha codebase for version 2 of WireGuard Portal.
This version is considered unstable and incomplete (for example, no public REST API)! 
Use with care!


Fixes/Implements the following issues:
 - OAuth support #154, #1 
 - New Web UI with internationalisation support #98, #107, #89, #62
 - Postgres Support #49 
 - Improved Email handling #47, #119 
 - DNS Search Domain support #46 
 - Bugfixes #94, #48 

---------

Co-authored-by: Fabian Wechselberger <wechselbergerf@hotmail.com>

internal/app/users/repos.go

@@ -0,0 +1,18 @@
+package users
+
+import (
+	"context"
+	"github.com/h44z/wg-portal/internal/domain"
+)
+
+type UserDatabaseRepo interface {
+	GetUser(ctx context.Context, id domain.UserIdentifier) (*domain.User, error)
+	GetAllUsers(ctx context.Context) ([]domain.User, error)
+	FindUsers(ctx context.Context, search string) ([]domain.User, error)
+	SaveUser(ctx context.Context, id domain.UserIdentifier, updateFunc func(u *domain.User) (*domain.User, error)) error
+	DeleteUser(ctx context.Context, id domain.UserIdentifier) error
+}
+
+type PeerDatabaseRepo interface {
+	GetUserPeers(ctx context.Context, id domain.UserIdentifier) ([]domain.Peer, error)
+}