perf: Optimize dataset preview performance

[bprusinowski]

This PR improves the performance of fetching dataset preview by ditching the current logic (using rdf-cube-view-query library) in favor of a custom CONSTRUCT query. It also removes Run SPARQL query button from dataset preview page.

In the future, we might also adapt and extract the logic to be reused when fetching components, to avoid querying the whole shape (and e.g. unit labels separately, as was the case before) and instead focus on the properties that we actually need.

Improvement: one of the largest datasets (Electricity tariff per provider) loads in around 5s on TEST; in the PR, it takes around 0.5s.

Thanks @Rdataflow for the inspiration and providing an example query 🎉

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Name	Status	Preview	Comments	Updated (UTC)
visualization-tool	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Feb 13, 2024 9:03am

[bprusinowski]

@Rdataflow dataset preview for BLW cubes is broken due to errors in the data, see that the landing page is localized while it shouldn't be: https://s.zazuko.com/2ionzw1. It works on TEST, because there we query for cube metadata using the old way, while now we switched to a dedicated query (DataCubeMetadata).

This problem will be addressed in the near future by Zazuko 👍

[ptbrowne]

Thanks !

[Rdataflow]

@bprusinowski well done 🎉