Add height-query function to Tileset #2166

Job	Run time
Quick Checks	8s
ubuntu-latest / gcc / Debug	3m 49s
Documentation	12m 1s
ubuntu-latest / gcc / RelWithDebInfo	7m 35s
ubuntu-20.04 / clang / Debug	3m 34s
windows-2019 / Debug	4m 45s
ubuntu-20.04 / clang / RelWithDebInfo	3m 33s
macos-12 / clang / Debug	5m 17s
windows-2019 / RelWithDebInfo	4m 51s
macos-12 / clang / RelWithDebInfo	4m 12s
windows-2022 / Debug	4m 51s
windows-2022 / RelWithDebInfo	4m 52s
	59m 28s

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