Refactor VisualizationProvider to expose an itemMap instead of the explore

[ZeRego]

The visualization provider shouldn't be directly dependent on the explore object/data.
Instead, it should base itself on an itemsMap: Record<string, Item> which contains all the necessary data for the visualization and configuration.

Update:

• add itemMap to context ( the value should come from the explore + resultsData?.metricQuery )
• remove explore, dimensions, metrics, customDimensions, customMetrics, allMetrics, allNumericMetrics from the context and use the itemMap instead

This will:

• reduce duplicated code
• reduce hooks loops
• centralize data+logic

This is preparation work for Refactor metric query results types#8145

[lightdash-bot]

🎉 This issue has been resolved in version 0.899.2 🎉

The release is available on:

• 0.899.2
• GitHub release

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