feat: add upload/download for sas content

[scottdover]

Summary
This makes a few changes around uploading/downloading files in the sas extension:

• This adds an Upload context menu item to SAS content: This feature allows a user to upload one or more files to sas content
• This adds a Download context menu item to SAS content: This allows you to download one or more files or folders, and specify where to save them
  • NOTE: This doesn't allow you to specify file name when you are specifying a single file to download. This is to make it such that we have consistency between downloading a single file or multiple files. The single file will be persisted with the same name from SAS content
• This adds a Download context menu item to the results pane. Clicking this will allow the user to save the results as an html file
• This introduces ResultsPanelSubscriptionProvider which is responsible for handling commands against the results panel

Testing

• Tested uploading single and multiple files
• Tested downloading single files, files + folder, files + folder + a subset of children in the folder
• Tested downloading results (tested w/ tables & sgplots)

[Zhirong2022]

It failed to download files with Windows OS.
Error details:
Error running command SAS.downloadResource: Unable to resolve filesystem provider with relative file path 'c:\VSCCode\NewFile.sas'. This is likely caused by the extension that contributes SAS.downloadResource.

[Zhirong2022]

Local files are not shown on file selection window if trying to Upload one with Windows OS.

[Zhirong2022]

'Uploading files...' keeps showing in some scenarios.

1. If trying to upload the same file folder and its subs on the second time to the same place
2. If trying to upload a file with large size. It is more than 20M.

[scottdover]

'Uploading files...' keeps showing in some scenarios.

1. If trying to upload the same file folder and its subs on the second time to the same place
2. If trying to upload a file with large size. It is more than 20M.

This has been resolved in 41016de. You should now see an error message and the Uploading files... message dismissed in both of these instances.

NOTE: The messaging is not ideal for a file > 20M (it just says something generic about an upload failure). That said, this is also the case w/ dragging + dropping a file. For now, I think this is probably sufficient but at some future point we may want to investigate making our failure messages a little more granular.

[scottdover]

It failed to download files with Windows OS.
Error details:
Error running command SAS.downloadResource: Unable to resolve filesystem provider with relative file path 'c:\VSCCode\NewFile.sas'. This is likely caused by the extension that contributes SAS.downloadResource.

Local files are not shown on file selection window if trying to Upload one with Windows OS.

I'm currently waiting on a windows VM to be able to test/debug these.

[scottdover]

It failed to download files with Windows OS.
Error details:
Error running command SAS.downloadResource: Unable to resolve filesystem provider with relative file path 'c:\VSCCode\NewFile.sas'. This is likely caused by the extension that contributes SAS.downloadResource.

Local files are not shown on file selection window if trying to Upload one with Windows OS.

I'm currently waiting on a windows VM to be able to test/debug these.

These should both be resolved now (by 22dadbd and 6c39b07). The behavior of uploads has been tweaked a bit. On Mac, a user can use the Upload menu item and choose a mix of files and folders to upload.

On Windows & Linux, a user will be presented with two options: Upload File(s) and Upload Folder(s) (mixing and matching isn't allowed on those OSes). Those options will allow you to choose one type to upload at a time.

[scottdover]

@Zhirong2022 This is ready to test again when you have a moment

[Zhirong2022]

@scottdover Thank you so much for your investigation and help. I verified the issues in Windows OS, it can upload files and folders through Upload file(s) and Upload folder(s) on the context menu. For the error prompt, it can be enhanced. I have no other concerns.