All fee estimate horizons, in increasing order of half-life.
Declared in <policy/fees/block_policy_estimator.h>
inline constexpr auto ALL_FEE_ESTIMATE_HORIZONS = std::array{
FeeEstimateHorizon::SHORT_HALFLIFE,
FeeEstimateHorizon::MED_HALFLIFE,
FeeEstimateHorizon::LONG_HALFLIFE,
};