Improve webview display of SPARQL SELECT results

[BenjaminHofstetter]

Features needed

• show language tags
• show / hide datatype

Bugs:

• xml literals are shown as <xml ...>
• langest prefix match -> comment 2

Consider to use https://code.visualstudio.com/blogs/2021/10/11/webview-ui-toolkit https://github.com/microsoft/vscode-webview-ui-toolkit

[BenjaminHofstetter]

Here some sample tags

# [endpoint=http://lindas.admin.ch/query]
PREFIX schema: <http://schema.org/>

SELECT * FROM <https://lindas.admin.ch/fch/curia> {
    <https://politics.ld.admin.ch/party/1576> ?p ?o .
} LIMIT 50

[BenjaminHofstetter]

done