Integrate with sockets API to show progress

[dancgray]

Affected Area

Framework import, also download and source export

Requested Feature

Would be nice to show user more information about progress. Particularly where they have multiple stages or are large files such as framework import.

Use Case

Import large course that includes new plugins and assets. Import updates user when different stages of the import have completed such as plugin import, asset import etc.

Current Workaround

None

Additional Information

Taken from developer TODO notes in framework import code.

[taylortom]

Wrote this a while ago, haven't tested it since the refactor though: https://github.com/taylortom/adapt-socket