Move exemplar types to non-internal package #14432

Job	Run time
lint	2m 18s
compatibility-test (1.23.0, ubuntu-latest, 386)	30s
compatibility-test (1.23.0, ubuntu-latest, amd64)	1m 22s
test-concurrent-safe	4m 11s
test-bench	52s
compatibility-test (1.23.0, macos-13, amd64)	2m 20s
test-coverage	1m 2s
compatibility-test (1.23.0, macos-latest, arm64)	1m 2s
test-race	2m 18s
compatibility-test (1.23.0, windows-latest, 386)	3m 16s
compatibility-test (1.23.0, windows-latest, amd64)	2m 29s
compatibility-test (1.23.0, actuated-arm64-2cpu-8gb, arm64)	2m 1s
compatibility-test (~1.22.5, ubuntu-latest, 386)	27s
compatibility-test (~1.22.5, ubuntu-latest, amd64)	1m 14s
compatibility-test (~1.22.5, macos-13, amd64)	1m 50s
compatibility-test (~1.22.5, macos-latest, arm64)	43s
compatibility-test (~1.22.5, windows-latest, 386)	1m 37s
compatibility-test (~1.22.5, windows-latest, amd64)	3m 20s
compatibility-test (~1.22.5, actuated-arm64-2cpu-8gb, arm64)	1m 58s
codecov	6s
test-compatibility	1s
	34m 57s

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