Allow await on top level in Workspace

[onsetsu]

Currently, we cannot use await to wait for Promises in Workspaces (e.g. when fetching a resource).

To fix this: Update source code transformation to allow for top-level await statements.

When alternating the source code transformation, we have to consider the following:

• Arrange the order to move imports to the top of the file.
• Enclose all other statements in an asyncronous iife.
  • the function should return a do-expression over all moved statements to provide the last evaluated statement as result
• take care of top-level variables, that still need to be recorded

[JensLincke]

BUMP BUMP BUMP @onsetsu BUMP BUMP BUMP
I want this feature, I have to type the following code over and over and over

var value;
(async () => {
  value = await somthin()
})()