fix: remove caching of files

[cbaker6]

New Pull Request Checklist

• I am not disclosing a vulnerability.
• I am creating this PR in reference to an issue.

Issue Description

Accessing a cached file does not result in the actual file. This is due to the OS caching policy not directly having a way to cache URLSessionDownloadTask. In addition, caching files is most likely filling up the cache too quickly, removing queries and other data from cache earlier than expected.

Related issue: #413, #226

Approach

Remove file caching from the SDK. If developers want to check if a file has already been saved they can check the download directory for the file name. Below is sample code for reference:

@MainActor
    static func fetchImage(_ file: ParseFile?) async -> UIImage? {
        let defaultImage = UIImage(systemName: "camera")
        guard let file = file,
              let fileManager = ParseFileManager(),
              let defaultDirectoryPath = fileManager.defaultDataDirectoryPath else {
            return defaultImage
        }
        let downloadDirectoryPath = defaultDirectoryPath
            .appendingPathComponent(Constants.fileDownloadsDirectory, isDirectory: true)
        let fileLocation = downloadDirectoryPath.appendingPathComponent(file.name).relativePath
        if FileManager.default.fileExists(atPath: fileLocation) {
            guard let image = UIImage(contentsOfFile: fileLocation) else {
                do {
                    let image = try await file.fetch()
                    if let path = image.localURL?.relativePath,
                       let image = UIImage(contentsOfFile: path) {
                        return image
                    } else {
                        return defaultImage
                    }
                } catch {
                    Logger.home.error("Error fetching picture: \(error.localizedDescription)")
                    return defaultImage
                }
            }
            return image
        } else {
            guard let path = file.localURL?.relativePath,
                  let image = UIImage(contentsOfFile: path) else {
                      do {
                          let image = try await file.fetch()
                          if let path = image.localURL?.relativePath,
                                let image = UIImage(contentsOfFile: path) {
                              return image
                          } else {
                              return defaultImage
                          }
                    } catch {
                        Logger.home.error("Error fetching picture: \(error.localizedDescription)")
                        return defaultImage
                    }
            }
            return image
        }
    }

TODOs before merging

• Add tests
• Add entry to changelog

[parse-github-assistant]

Thanks for opening this pull request!

• 🎉 We are excited about your hands-on contribution!

[codecov]

Codecov Report

Base: 90.01% // Head: 90.06% // Increases project coverage by +0.04% 🎉

Coverage data is based on head (1511564) compared to base (baf70f6).
Patch has no changes to coverable lines.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #414      +/-   ##
==========================================
+ Coverage   90.01%   90.06%   +0.04%     
==========================================
  Files         159      159              
  Lines       15323    15308      -15     
==========================================
- Hits        13793    13787       -6     
+ Misses       1530     1521       -9     

Impacted Files	Coverage Δ
Sources/ParseSwift/Extensions/URLSession.swift	83.39% <ø> (+1.25%)	⬆️
Sources/ParseSwift/Objects/ParseUser.swift	87.26% <0.00%> (+0.17%)	⬆️
Sources/ParseSwift/API/API+Command.swift	89.81% <0.00%> (+0.20%)	⬆️

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