Add QUICHE_ARRAYSIZE.
Add QUICHE_ARRAYSIZE.

gfe-relnote: n/a, adding unused code.
PiperOrigin-RevId: 285454180
Change-Id: I8c88eb4c39f8456ffccd33f7f04b1675ac14cf76

google/quiche,google/quiche,google/quiche,google/quiche