Add support for pivot table label/value filters

[nathcoad]

Description

Excelize can currently set a page filter for a pivot table, but does not seem to support creating label/value filters.

When running the sample code from https://xuri.me/excelize/en/pivot.html#AddPivotTable there is a page filter set for region, but clicking on the row filter in excel allows user to create label or value filters. For example,

Adding this value filter results in the following xml in pivotTables/pivotTable1.xml (including data above and below the filters node for context)

    <pivotTableStyleInfo name="PivotStyleLight16" showRowHeaders="1" showColHeaders="1"
        showRowStripes="0" showColStripes="0" showLastColumn="1" />
    <filters count="1">
        <filter fld="0" type="valueGreaterThan" evalOrder="-1" id="3" iMeasureFld="0">
            <autoFilter ref="A1">
                <filterColumn colId="0">
                    <customFilters>
                        <customFilter operator="greaterThan" val="5000" />
                    </customFilters>
                </filterColumn>
            </autoFilter>
        </filter>
    </filters>
    <extLst>
        <ext uri="{747A6164-185A-40DC-8AA5-F01512510D54}"
            xmlns:xpdl="http://schemas.microsoft.com/office/spreadsheetml/2016/pivotdefaultlayout">
            <xpdl:pivotTableDefinition16 />
        </ext>
    </extLst>
</pivotTableDefinition>

There are many filter operators such as equals, greater than, between, etc.

Output of go version:

go version go1.21.6 darwin/arm64

Excelize version or commit ID:

v2.8.1

Adding this feature would be greatly appreciated. Thankyou for all your amazing work on this module!