Import FCU_TAXREF SSSOM mappings

[syphax-bouazzouni]

The source file https://entrepot.recherche.data.gouv.fr/dataset.xhtml?persistentId=doi:10.57745/LVRFWJ

Currently, this file is not valid:

• Spaces and tabs are badly encoded (surely opened with Excel)
• Don't know why but the columns subject_type et object_type can't be parsed even if they seem current, respectively skos:Concept and `owl:Class.
• Jmapping_cardinality need to be n:n not N:N
• Date are not valid; e.g 2023-02-03T00:00:00Z need to be changed to 2023-02-03