Index all supported properties automatically

[malberts]

From #257 (comment)

Don't filter on configured properties here:

WikibaseFacetedSearch/src/Application/StatementListTranslator.php

Lines 46 to 56 in 1ae22cf

	private function getPropertiesToIndex( ItemId $itemType ): array {
	$properties = array_values(
	array_map(
	fn( FacetConfig $config ) => $config->propertyId,
	$this->config->getFacetConfigForItemType( $itemType )
	)
	);
	$properties[] = $this->config->getItemTypeProperty();
	return $properties;
	}

Instead, allow all properties to be indexed, but use the null return value in https://github.com/ProfessionalWiki/WikibaseFacetedSearch/blob/master/src/Application/DataValueTranslator.php to skip unsupported properties.

Optionally, add config to enable/disable automatic indexing.

[physikerwelt]

Related to #228

[JeroenDeDauw]

Optionally, add config to enable/disable automatic indexing.

I think the index-everything behavior should be behind configuration. Something like $wgWikibaseFacetedSearchIndexAllProperties = true