Function get_dict_id_from_frame

Wraps the ZSTD_getDictID_fromFrame() function.

Returns None if the dictionary ID could not be decoded. This may happen if:

• The frame was not encoded with a dictionary.
• The frame intentionally did not include dictionary ID.
• The dictionary was non-conformant.
• src is too small and does not include the frame header.
• src is not a valid zstd frame prefix.