TypeScript conversion so we have accurately generated types for consumers #395

Job	Run time
[email protected]	1m 40s
Lint	43s
[email protected]	1m 36s
[email protected]	1m 35s
[email protected]	1m 29s
typescript@next	1m 32s
Floating Dependencies (ubuntu-latest, chrome)	50s
Tests (ubuntu-latest, chrome, 16)	44s
Floating Dependencies (ubuntu-latest, firefox)	39s
Tests (ubuntu-latest, chrome, 18)	37s
Tests (ubuntu-latest, firefox, 16)	1m 1s
Tests (ubuntu-latest, firefox, 18)	56s
Docs app	41s
Tests - ember-lts-3.28	1m 14s
Tests - ember-lts-4.4	1m 1s
Tests - ember-lts-4.12	1m 5s
Tests - ember-release	1m 14s
Tests - ember-beta	56s
Tests - ember-classic	56s
Tests - embroider-safe	20m 16s
Tests - embroider-optimized	20m 15s
Tests - ember-canary	56s
	1h 1m 56s

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