Add helper functions for PROTOCOL_QUIC_CRYPTO versions.
gfe-relnote: n/a (add functions that are currently only used in tests)
PiperOrigin-RevId: 298882420
Change-Id: If759ab3850d8054a257d3129cfb2c2bccf155a1f
QUICHE (QUIC, Http/2, Etc) is Google‘s implementation of QUIC and related protocols. It powers Chromium as well as Google’s QUIC servers and some other projects.