S3 streaming support

[andonovn]

Not sure if this is considered a bug fix or a new feature.

Checklist:

• Changes are covered by unit tests
• Code style is respected
• Commit message explains why the change is made (see https://github.com/erlang/otp/wiki/Writing-good-commit-messages)
• CHANGELOG.md contains a short summary of the change
• Documentation is updated as necessary

Why this change is needed?

Currently, it's impossible to stream the file to s3. The following is the error when someone attempts to do so:

ZipArchive::close()
/var/www/application/vendor/phpoffice/phpspreadsheet/src/PhpSpreadsheet/Writer/Xlsx.php:409

The solution provided in this PR is very naive, and not elegant at all, but it works.
Another option would be to extract strtolower($pFilename) == 'php://output' || strtolower($pFilename) == 'php://stdout' to a protected method, which could be overriden by the consumers.
There are more complex options as well, fe creating different adapters, but unfortunately I don't really have time to work on them.

But the main goal of this PR is to open a discussion around this. I am curious to know if you are willing to add S3 streaming support at all.

[PowerKiKi]

We have #1292 to add support for writing to resources in a more general way. I believe that would make this PR obsolete.