[ADF-4083] search facetIntervals - empty spaced labels support (#4327)

* [ADF-4083] fix space-label issue for intervals

* [ADF-4083] remove mention to [SEARCH-1487] issue

- for future reference, also check https://issues.alfresco.com/jira/browse/ADF-4144

* [ADF-4083] add missing types

* [ADF-4083] refactor method

* [ADF-4083] fix test

* [ADF-4083] small refactoring

* [ADF-4083] better param naming

* [ADF-4083] changes after rebase - keep better param naming

* [ADF-4083] fix space-label issue for the sets of intervals

* [ADF-4083] update test

lib/content-services/search/search-query-builder.service.ts

@@ -323,9 +323,15 @@ export class SearchQueryBuilderService {
 
             return {
                 intervals: configIntervals.intervals.map((interval) => <any> {
-                    label: interval.label,
+                    label: this.getSupportedLabel(interval.label),
                     field: interval.field,
-                    sets: interval.sets
+                    sets: interval.sets.map((set) => <any> {
+                        label: this.getSupportedLabel(set.label),
+                        start: set.start,
+                        end: set.end,
+                        startInclusive: set.startInclusive,
+                        endInclusive: set.endInclusive
+                    })
                 })
             };
         }