Using custom FileManager attributes for DiskStorage

[ignotusverum]

Hello,

I am wondering what would be the best way to pass any additional attributes to the DiskStorage? One of the requirements that we currently have for one of the projects - is to have .complete(FileProtectionType) protection as we need to ensure that any data we're storing on disk is encrypted at rest - at least when the device is locked.

[ignotusverum]

From my quick research - it seems like the best place to do so would be here(existing files) and here(new files) but wondering about possible alternatives that can be used at the moment

[ignotusverum]

Something that I am planning to propose it to have updated func store(...) that is going to look like:

public func store(
  value: T,
  forKey key: String,
  writingOptions: NSData.WritingOptions = [],
  expiration: StorageExpiration? = nil) throws
{
...
  do {
    try data.write(to: fileURL, options: writingOptions)
  }
...
}

would still need to figure out the best way to tackle already existing files, potentially it's going to look like:

public func store(
    value: T,
    forKey key: String,
    writingOptions: NSData.WritingOptions = [],
    additionalAttributes: [FileAttributeKey: Any] = [:],
    expiration: StorageExpiration? = nil) throws {...}

Where we are going to merge "default" attributes with additional ones

[ignotusverum]

Merged here #1793