Add HTTP/3 error codes, use them in HttpDecoder and for unexpected frames in QuicSpdyStream and QuicReceiveControlStream. ENUM_VALUE_OK=Only changing value of sentinel entry QUIC_LAST_ERROR. gfe-relnote: n/a, change to QUIC v99-only code. Protected by existing disabled gfe2_reloadable_flag_quic_enable_version_99. PiperOrigin-RevId: 290374408 Change-Id: I90837f021f0dd585f8015d2fcae37d0d0eacfed6