h3: allow the frame module to be public under a new feature (#1689) #4671

Job	Run time
docker	2m 10s
http3_test	1m 19s
nginx (1.16.1)	1m 7s
quiche	4m 7s
quiche (boringssl-boring-crate)	3m 41s
quiche_ios (x86_64-apple-ios)	1m 59s
quiche_ios (aarch64-apple-ios)	1m 50s
quiche_macos	3m 29s
quiche_multiarch (aarch64-unknown-linux-gnu)	3m 23s
quiche_windows (x86_64-pc-windows-msvc)	3m 32s
quiche_multiarch (armv7-unknown-linux-gnueabihf)	3m 44s
quiche_windows (i686-pc-windows-msvc)	4m 26s
quiche_multiarch (i686-unknown-linux-gnu)	2m 24s
quiche_windows (x86_64-pc-windows-gnu)	5m 10s
quiche_windows (i686-pc-windows-gnu)	4m 41s
android_ndk_lts (aarch64-linux-android)	1m 29s
android_ndk_lts (armv7-linux-androideabi)	1m 32s
android_ndk_lts (x86_64-linux-android)	1m 31s
android_ndk_lts (i686-linux-android)	1m 35s
	53m 9s

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