Allow specifying request headers in TilesetOptions #3081

Job	Run time
Linting	28m 54s
Documentation	13m 9s
ubuntu-22.04 / gcc / Debug	22m 12s
Quick Checks	6s
ubuntu-22.04 / gcc / RelWithDebInfo	29m 1s
windows-2022 / Debug	27m 57s
ubuntu-20.04 / clang / Debug	21m 50s
windows-2022 / RelWithDebInfo	32m 5s
ubuntu-20.04 / clang / RelWithDebInfo	27m 18s
macos-13 / clang / Debug	12m 40s
macos-13 / clang / RelWithDebInfo	16m 27s
	3h 51m 39s

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