move errors to a different file

src/session/session_errors.go

@@ -0,0 +1,7 @@
+package session
+
+import "errors"
+
+var ErrSessionNotFound = errors.New("session not found")
+var ErrSessionAlreadyExists = errors.New("session already exists")
+var ErrSessionExpired = errors.New("session expired")

src/session/session_in_memory.go

@@ -1,7 +1,6 @@
 package session
 
 import (
-	"errors"
 	"sync"
 	"time"
 
@@ -9,10 +8,6 @@ import (
 	"astraltech.xyz/accountmanager/src/worker"
 )
 
-var ErrSessionNotFound = errors.New("session not found")
-var ErrSessionAlreadyExists = errors.New("session already exists")
-var ErrSessionExpired = errors.New("session expired")
-
 type MemoryStore struct {
 	sessions map[string]*SessionData
 	lock     sync.RWMutex