Function parse_funding_rate 

pub fn parse_funding_rate(
    ax_rate: &AxFundingRate,
    instrument_id: InstrumentId,
    ts_init: UnixNanos,
) -> Result<FundingRateUpdate>

Parses an Ax funding rate into a Nautilus [FundingRateUpdate].

Errors

Returns an error if the timestamp is invalid.