feat: add get my password policy (#346)

* feat: add get my password policy

* fix: failed merges

internal/auth/repository/policy.go

@@ -0,0 +1,10 @@
+package repository
+
+import (
+	"context"
+	"github.com/caos/zitadel/internal/policy/model"
+)
+
+type PolicyRepository interface {
+	GetMyPasswordComplexityPolicy(ctx context.Context) (*model.PasswordComplexityPolicy, error)
+}