Create __all__ for all python files (#589)

* add __all__ to files "adjustmentsinfo.py" and "albuminfo.py"

* add __all__ to file "cli.py"

* add __all__ to all files that misses except files with prefix "_"

osxphotos/searchinfo.py

@@ -23,6 +23,8 @@ from ._constants import (
     SEARCH_CATEGORY_YEAR,
 )
 
+__all__ = ["SearchInfo"]
+
 
 class SearchInfo:
     """Info about search terms such as machine learning labels that Photos knows about a photo"""