Migrate ember to TS

[aromanarguello]

Issue: #5030

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[ndelangen]

now deploy is incomplete because of some error, but locally it seems to work fine (so far)

[ndelangen]

Verified this works, @aromanarguello Is this PR ready?

[aromanarguello]

@ndelangen Do you want me to rebase and re-push? I see some there are failures with the CI that's why I didn't want to make it ready for review, I think I've converted every file. What are your thoughts?

[ndelangen]

I don't think there's a need to do that @aromanarguello, unless you want to change any code, but if not, I think it's merge-able.

Will you do the honours?