feat(gl): expose ledger application and grpc operations

domain/ledger/errors.go

@@ -0,0 +1,10 @@
+package ledger
+
+import "errors"
+
+var (
+	ErrNotFound            = errors.New("ledger record not found")
+	ErrIdempotencyConflict = errors.New("idempotency key belongs to a different payload")
+	ErrIncompleteJournal   = errors.New("idempotency key belongs to an unsealed journal")
+	ErrAlreadyReversed     = errors.New("journal already has a reversal")
+)