Standard / ISO19139 / Formatter / SDMX

In order to interact with the ESS Metadata Handler (https://cros.ec.europa.eu/book-page/technical-specifications-file-export-and-import-ess-metadata-handler), SDMX format can be used.

This formatter is quite specific to indicator provided to Eurostat (eg. https://ec.europa.eu/eurostat/cache/metadata/en/sdg_01_10_esmsip2.htm) and requires dedicated ISO19139 template and vocabularies (see EEA editor configuration for statistical datasets https://github.com/eea/geonetwork-eea/blob/eea-4.4.x/schemas/iso19139/src/main/plugin/iso19139/layout/config-editor.xml#L1667-L1727) but can serve as a basis for a more generic SDMX metadata export at some point.

Follow up of SDMX vocabulary support geonetwork/core-geonetwork#7790

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