fares: support AvailabilityConditions and ValidityConditions

[jclgoodwin]

Go North East has special fares after 7pm, for example. Alas the Name and Description don't tell us which fare table is which

And I need to support FromDate and ToDate especially with various fare increases around the country

        <FareFrame version="1.0" id="epd:UK:GNEL:FareFrame_UK_PI_FARE_PRODUCT:Line_1_Inbound:op" dataSourceRef="data_source" responsibilitySetRef="tariffs">
          <TypeOfFrameRef ref="fxc:UK:DFT:TypeOfFrame_UK_PI_FARE_PRODUCT:FXCP" version="fxc:v1.0" />
          <tariffs>
            <Tariff id="Tariff@AdultSingle@Line_1_Inbound" version="1.0">
              <validityConditions>
                <ValidBetween>
                  <FromDate>2021-05-18T00:00:00</FromDate>
                  <ToDate>2029-12-31T00:00:00</ToDate>
                </ValidBetween>
              </validityConditions>
              <Name>Go North East 1 Inbound - Adult Single fares</Name>
              <OperatorRef version="1.0" ref="noc:GNEL" />
              <LineRef ref="1_Inbound" version="1.0" />
              <TariffBasis>zoneToZone</TariffBasis>
              <qualityStructureFactors>
                <FareDemandFactor id="op@Tariff@Demand" version="1.0">
                  <validityConditions>
                    <AvailabilityCondition id="op@Tariff@Condition@f79084af-a564-4a34-84c7-020219687810" version="1.0">
                      <IsAvailable>true</IsAvailable>
                      <dayTypes>
                        <FareDayType id="op@Tariff@DayType@f79084af-a564-4a34-84c7-020219687810" version="1.0">
                          <EarliestTime>00:00:00</EarliestTime>
                          <DayLength>PT2H59M</DayLength>
                          <properties>
                            <PropertyOfDay>
                              <DaysOfWeek>Monday Tuesday Wednesday Thursday Friday Saturday Sunday</DaysOfWeek>
                            </PropertyOfDay>
                          </properties>
                        </FareDayType>
                      </dayTypes>
                    </AvailabilityCondition>
                  </validityConditions>
                </FareDemandFactor>
              </qualityStructureFactors>

        <FareFrame version="1.0" id="epd:UK:GNEL:FareFrame_UK_PI_FARE_PRODUCT:Line_1_Inbound:op" dataSourceRef="data_source" responsibilitySetRef="tariffs">
          <TypeOfFrameRef ref="fxc:UK:DFT:TypeOfFrame_UK_PI_FARE_PRODUCT:FXCP" version="fxc:v1.0" />
          <tariffs>
            <Tariff id="Tariff@AdultSingle@Line_1_Inbound" version="1.0">
              <validityConditions>
                <ValidBetween>
                  <FromDate>2021-05-18T00:00:00</FromDate>
                  <ToDate>2029-12-31T00:00:00</ToDate>
                </ValidBetween>
              </validityConditions>
              <Name>Go North East 1 Inbound - Adult Single fares</Name>
              <OperatorRef version="1.0" ref="noc:GNEL" />
              <LineRef ref="1_Inbound" version="1.0" />
              <TariffBasis>zoneToZone</TariffBasis>
              <qualityStructureFactors>
                <FareDemandFactor id="op@Tariff@Demand" version="1.0">
                  <validityConditions>
                    <AvailabilityCondition id="op@Tariff@Condition@effc9a9a-81d2-488e-a7bf-cca662b7f804" version="1.0">
                      <IsAvailable>true</IsAvailable>
                      <dayTypes>
                        <FareDayType id="op@Tariff@DayType@effc9a9a-81d2-488e-a7bf-cca662b7f804" version="1.0">
                          <EarliestTime>19:00:00</EarliestTime>
                          <DayLength>PT4H59M</DayLength>
                          <properties>
                            <PropertyOfDay>
                              <DaysOfWeek>Monday Tuesday Wednesday Thursday Friday Saturday Sunday</DaysOfWeek>
                            </PropertyOfDay>
                          </properties>
                        </FareDayType>
                      </dayTypes>
                    </AvailabilityCondition>
                  </validityConditions>
                </FareDemandFactor>
              </qualityStructureFactors>