Decoded NTPv4 packet header (RFC 5905).
leapVersionMode: { leapIndicator: number; version: number; mode: number; }
stratum: number
poll: number
precision: number
rootDelay: number
rootDispersion: number
referenceId: number
referenceTimestamp: bigint
originTimestamp: bigint
receiveTimestamp: bigint
transmitTimestamp: bigint