sayari-analytics/pyisic

feat: add NACEBEL 2003 & 2008

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https://economie.fgov.be/sites/default/files/Files/Entreprises/KBO/conversiontable-Nacebel-2003-2008.xls

Add both versions as standards and concordance of 2003 -> 2008. We might also add 2008 -> NACE2 by finding how they are mapped (they should be 1-1 with some additions in 2008)