feat: implement sas file system for viya connections

[scottdover]

Summary wip

Testing How did you test this change?

Todos

• [x] Create file/folder
• [x] Rename file/folder
• [x] Save/update file
• [x] Move file/folder
• [x] Download file/folder
• [x] Upload file/folder
• [x] Drag & Drop files/folders
• [x] Delete files/folders
• [x] Rename "Explorer" to "SAS Content"
• [x] Paginate & sort files/folders
• [x] Make sure refresh works as expected
• [x] Make sure connections are refreshed when they become stale
• [x] Make sure content adapters are flexible to work with and without recycle bin
• [x] Make sure we're able to convert a sas notebook to a flow in sas server
• [x] Make sure we have the correct icons for sas server related things