Have addons implement their API at compile time #420

Job	Run time
build	1m 13s
test-unit-parallel (18, ubuntu)	1m 54s
test-api-parallel (18, ubuntu, chromium)	2m 51s
test-playwright-parallel (18, ubuntu, chromium)	2m 19s
test-unit-parallel (18, macos)	1m 55s
test-api-parallel (18, ubuntu, firefox)	3m 0s
test-playwright-parallel (18, ubuntu, firefox)	2m 6s
test-unit-parallel (18, windows)	6m 42s
test-playwright-parallel (18, ubuntu, webkit)	2m 11s
lint	1m 31s
release-dry-run (18)	1m 49s
test-unit-coverage	1m 19s
test-unit (16, ubuntu)	59s
test-api (18, windows, chromium)	6m 56s
test-unit (16, macos)	1m 36s
test-api (18, windows, firefox)	8m 44s
test-unit (16, windows)	7m 0s
	54m 5s

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