Formatter / DCAT / Add some more media type mapping to EU vocabuary

[fxprunayre]

If no match, data.europa.eu display UNKNOWN.

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• I have read the contribution guidelines
• Pull request provided for main branch, backports managed with label
• Good housekeeping of code, cleaning up comments, tests, and documentation
• Clean commit history broken into understandable chucks, avoiding big commits with hundreds of files, cautious of reformatting and whitespace changes
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• Build documentation provided for development instructions in README.md files
• Library management using pom.xml dependency management. Update build documentation with intended library use and library tutorials or documentation

[CLAassistant]

All committers have signed the CLA.

[josegar74]

These 2 keys are the same, is this correct?

[fxprunayre]

Yes the mapping here is to convert distribution format or "WWW:DOWNLOAD:format" protocol values to the EU vocabulary. So various values may be used. Here geotiff are sometimes using application/x-worldfile for the world file.