ecode: add new ecode for "no cell found with digit suffix"

[wenchy]

Debugging: 
        Module: confgen
        BookName: conf/client/Common/DB/excel/MartialPotential/MartialPotential.xlsx
        SheetName: PotentialLevel
        DataCellPos: B5
        DataCell: 0
        PBMessage: MartialPotentialLevelConf
        PBFieldName: protoconf.MartialPotentialLevelConf.Potential.Level.upgrade_map
        PBFieldType: map<int32, protoconf.MartialPotentialLevelConf.Potential.Level.Cost>
        PBFieldOpts: name:"Upgrade"  key:"Type"  layout:LAYOUT_HORIZONTAL  sep:","  subsep:":"
        ColumnName: RealLevel
        Reason: no cell found with digit suffix
github.com/tableauio/tableau/xerrors.ErrorKV
        /root/go/pkg/mod/github.com/tableauio/[email protected]/xerrors/error.go:36
github.com/tableauio/tableau/xerrors.WrapKV
        /root/go/pkg/mod/github.com/tableauio/[email protected]/xerrors/error.go:23
github.com/tableauio/tableau/internal/confgen.ParseMessage
        /root/go/pkg/mod/github.com/tableauio/[email protected]/internal/confgen/parser.go:94
github.com/tableauio/tableau/load.loadOrigin
        /root/go/pkg/mod/github.com/tableauio/[email protected]/load/load.go:108
github.com/tableauio/tableau/load.Load
        /root/go/pkg/mod/github.com/tableauio/[email protected]/load/load.go:25