Improve performance for range widgets

Updated patch based on #19 to fix this error:

TypeError: Drupal\facets_range_widget\Plugin\facets\processor\SliderProcessor::Drupal\facets_range_widget\Plugin\facets\processor\{closure}(): Argument #1 ($a) must be of type Drupal\facets_range_widget\Plugin\facets\processor\ResultInterface, Drupal\facets\Result\Result given in Drupal\facets_range_widget\Plugin\facets\processor\SliderProcessor->Drupal\facets_range_widget\Plugin\facets\processor\{closure}() (line 36 of modules/contrib/facets/modules/facets_range_widget/src/Plugin/facets/processor/SliderProcessor.php).

Also, added rounding of the displayed values to defined precision.

I was not getting the error described in #26, but the patch in #26 applies to Facets 3.0.0-beta1 (as did patch #19) and my range slider still works correctly.

Minor fix for #26 for cases where min/max values are calculated with steps that are not whole numbers (e.g. '0.1').

Patch #28 applies to Facets 3.0.0-beta1 and my range slider still works correctly.

Minor changes for better calculations of min/max slider values when rounding floating numbers with custom precision.

Thank you. Patch #30 applies to Facets 3.0.0-beta1 and my range slider still works correctly. I'm using Drupal 9.5.9.

Thank you. #30 🐛 Improve performance for range widgets Needs review . This patch worked for me.

The patch from #30 works! Thanks!

#30 works perfectly! Thanks a lot!

Bumping to 3.x and can we move the latest patch into an MR so tests can be added (and existing ones executed)?