feat(errors): add new entity types for bank connections and transactions

Adds EntityBankConnection and EntityBankTransaction to the
errors package to enhance error handling capabilities related
to banking operations. This improves the clarity and
specificity of error messages associated with bank-related
entities.

error.go

@@ -36,6 +36,8 @@ const (
 	EntityTag                 = Entity("TAG")
 	EntityEntry               = Entity("ENTRY")
 	EntityEntryBasis          = Entity("ENTRY_BASIS")
+	EntityBankConnection      = Entity("BANK_CONNECTION")
+	EntityBankTransaction     = Entity("BANK_TRANSACTION")
 )
 
 type CodedError struct {