Add all errors to stub files

Author: rhpvorderman

src/isal/igzip_lib.pyi

@@ -31,7 +31,9 @@ MEM_LEVEL_SMALL: int
 MEM_LEVEL_MEDIUM: int
 MEM_LEVEL_LARGE: int
 MEM_LEVEL_EXTRA_LARGE: int
+
 IsalError: Exception
+error: Exception
 
 def compress(__data,
              level: int = ISAL_DEFAULT_COMPRESSION,

src/isal/isal_zlib.pyi

@@ -30,6 +30,7 @@ Z_FULL_FLUSH: int
 Z_FINISH: int
 
 error: Exception
+IsalError: Exception
 
 def adler32(__data, __value: int = 1) -> int: ...
 def crc32(__data, __value: int = 0) -> int: ...