Create small bar chart for facets

[trieloff]

• refactor(rum-explorer): use custom element for number formatting
• fix(rum-explorer): make sure all custom elements are defined uniformly
• fix(rum-explorer): align all html files
• fix(rum-explorer): control number formatting
• fix(rum-explorer): use common number formatting in sidebar
• fix(rum-explorer): guard against bad max precision
• refactor(rum-explorer): use one central number formatter
• fix(rum-explorer): do not append more and more extras when toggling facets
• feat(rum-explorer): provide minimal bar chart to facts

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Commits

• 903c93d ✅ (latest)
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• a589312 ❌
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• bbc8dff ❌