feat: support typescript

[suprabhat15]

Fixes #2354

Changes:

• Added typescript support by transpiling ts code into js based on discussion and suggestion
• Added typescript icon when .ts file is created

ts.support.mov

I have verified that this pull request:

• [✅] has no linting errors (npm run lint)
• [✅] has no test errors (npm run test)
• [✅] is from a uniquely-named feature branch and is up to date with the develop branch.
• [✅] is descriptively named and links to an issue number, i.e. Fixes #123

[suprabhat15]

@raclim @lindapaiste could you please review this?

[raclim]

Thank you so much for your work on this!

Currently, we're trying to keep changes to features related to the text editor and the TypeScript integration to a minimum, as they are being handled by our fellow for this summer. I think this might conflict with some of their work, so I don't think we can accept this PR for now but will revisit it again if we determine that might not be the case anymore. I'm really sorry that we couldn't get this in, but please feel free to check out our other issues, thanks again!