Add password support

[MohamedAshref371]

Password Parameter Handling

During testing and reviewing the internal code, it was confirmed that passing null as the password is handled correctly in both cases:

SevenZip.openInArchive in open method

Based on the internal code, it appears that passing the password as null will automatically call the method that does not have a password parameter.

item.extractSlow in getFile method

Testing showed that there is no issue with passing the password parameter as null. It is handled the same way as calling item.extractSlow without passing the password parameter.

Therefore, passing null as the password is safe and does not require separate handling in these cases.

[MohamedAshref371]

I tested it on the following archives:

1- ZIP archive without a password.
2- 7Z archive without a password.
3- ZIP archive with a password.
4- RAR5 archive with a password.
5- RAR5 archive with encrypted filenames.
6- 7Z archive with encrypted filenames.

Password: 123

[MohamedAshref371]

Separated the extractSlow call to explicitly handle the password and non-password cases.