Add Eclipse Theia (Visual Studio Code in DLTS)

[Gerhut]

This PR will add Eclipse Theia as an endpoint type to DLTS.

Build

Prerequisites:

• Node.js v10
• Yarn v1

cd src/theia
make build

Upload generated theia.tgz to public storage service like Azure Blob.

Configure

theia:
  tarball: https://blob.core.windows.net/theia.tgz

TO-DO

• [x] Endpoint Manager: Add start_theia script
• [x] RestfulAPI: Allow theia endpoint
• [x] Dashboard: Allow theia endpoint
• [x] Endpoint Manager: make download url configurable

[coveralls]

Pull Request Test Coverage Report for Build 3628

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 93.91%

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Totals
Change from base Build 3621:	0.0%
Covered Lines:	964
Relevant Lines:	1014

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💛 - Coveralls