Convert to V2 Addon, drop support for ember-source < v4 #2664

Job	Run time
Tests	36s
typescript@5.0	43s
Floating Dependencies	34s
typescript@5.1	42s
Lint	32s
typescript@5.2	47s
typescript@5.3	45s
typescript@5.4	41s
Try: ember-lts-3.16 @ test-apps/base-tests	43s
Try: ember-lts-3.28 @ test-apps/base-tests	58s
Try: ember-lts-4.12 @ test-apps/base-tests	58s
Try: ember-lts-5.12 @ test-apps/base-tests	51s
Try: ember-release @ test-apps/base-tests	57s
Try: ember-beta @ test-apps/base-tests	45s
Try: ember-canary @ test-apps/base-tests	45s
	11m 17s

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