Add C api for methods that are required to handle connection migratio… #4553

Job	Run time
http3_test	1m 12s
nginx (1.16.1)	54s
docker	5m 13s
android_ndk_lts (aarch64-linux-android)	1m 36s
quiche	3m 32s
android_ndk_lts (armv7-linux-androideabi)	1m 41s
quiche_ios (x86_64-apple-ios)	2m 39s
quiche_macos	2m 28s
quiche (boringssl-boring-crate)	3m 39s
android_ndk_lts (x86_64-linux-android)	1m 32s
quiche_ios (aarch64-apple-ios)	2m 22s
android_ndk_lts (i686-linux-android)	1m 37s
quiche_multiarch (aarch64-unknown-linux-gnu)	3m 28s
quiche_windows (x86_64-pc-windows-msvc)	4m 45s
quiche_multiarch (armv7-unknown-linux-gnueabihf)	3m 50s
quiche_windows (i686-pc-windows-msvc)	7m 25s
quiche_multiarch (i686-unknown-linux-gnu)	2m 16s
quiche_windows (x86_64-pc-windows-gnu)	5m 5s
quiche_windows (i686-pc-windows-gnu)	5m 34s
	1h 0m 48s

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