TypeScript conversion so we have accurately generated types for consumers #389

Job	Run time
Lint	35s
[email protected]	1m 34s
[email protected]	1m 34s
[email protected]	1m 29s
[email protected]	1m 29s
typescript@next	1m 28s
Floating Dependencies (ubuntu-latest, chrome)	41s
Tests (ubuntu-latest, chrome, 16)	55s
Floating Dependencies (ubuntu-latest, firefox)	1m 6s
Tests (ubuntu-latest, chrome, 18)	43s
Tests (ubuntu-latest, firefox, 16)	52s
Tests (ubuntu-latest, firefox, 18)	55s
Docs app	54s
Tests - ember-lts-3.28	1m 5s
Tests - ember-lts-4.4	56s
Tests - ember-lts-4.12	1m 5s
Tests - ember-release	1m 1s
Tests - ember-beta	1m 7s
Tests - ember-classic	1m 23s
Tests - embroider-safe	20m 13s
Tests - embroider-optimized	20m 14s
Tests - ember-canary	1m 2s
	1h 2m 21s

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