h3i: encode WaitType(Duration) as number #6039

Job	Run time
quiche_macos (macos-13)	4m 51s
quiche	4m 40s
quiche_macos (macos-latest)	2m 18s
quiche (boringssl-boring-crate)	4m 11s
quiche (openssl)	6m 22s
http3_test	52s
quiche_ios (x86_64-apple-ios)	1m 42s
quiche_windows (x86_64-pc-windows-msvc)	6m 21s
quiche_ios (aarch64-apple-ios)	1m 55s
quiche_windows (i686-pc-windows-msvc)	6m 30s
quiche_windows (x86_64-pc-windows-gnu)	7m 37s
quiche_windows (i686-pc-windows-gnu)	7m 23s
android_ndk_lts (aarch64-linux-android)	1m 6s
docker	2m 15s
android_ndk_lts (armv7-linux-androideabi)	1m 15s
android_ndk_lts (x86_64-linux-android)	1m 1s
quiche_multiarch (aarch64-unknown-linux-gnu)	3m 10s
android_ndk_lts (i686-linux-android)	1m 8s
quiche_multiarch (armv7-unknown-linux-gnueabihf)	3m 38s
quiche_multiarch (i686-unknown-linux-gnu)	2m 16s
	1h 10m 31s

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