Drag and drop image files into live share

[kmasuyama]

Product and Version [VS/VSCode]: vscode 1.36.1
OS Version [macOS/Windows]: windows 10
Live Share Extension Version: 1.0.509

It is possible for a client to add a file into a live share-served folder by dragging and dropping into the explorer (tested successfully with markdown document). However, this does not seem to work with image files or other binary formats. File sizes are seen to increase and cannot be opened properly. I'm aware image files are not currently supported for viewing over live share [#61, #1895]. However, it would still be convenient to be able to transfer image files into the project.

File formats tried and resulting file size increase:

format	size before (KB)	size after (KB)
md	4	4
png	3.67	7
jpg	340	617
bmp	2.28	5
pdf	561	989
exe	1112	1975

Steps to Reproduce / Scenario:

1. Go to explorer bar on client vscode
2. drag and drop binary file from local filesystem
3. go to shared folder location on host computer
4. try to open binary file

[Moniarchy]

Adding @lostintangent and @fubaduba

[Riz-waan]

This also happens with font files

[Riz-waan]

Also any idea if you guys will add a warning on drag and drop? I spent like 1 week debugging to see where the issue was.

[lostintangent]

Closing this as a duplicate of #1895.