Added selectedItemColor and unSelectedItemColor to the TabStrip (#8431)

* chore: add guard for ios

* feat(bottom-nav): adding new properties

* feat(tabs): new property implementation

* feat: new feature implementation in android

Implemented selectedItemColor and unSelectedItemColor properties on TabStrip

* chore: added some comments

* chore: change method return type

* fix: setting icon color

* fix: rendering mode setting

* chore: rename variable

* chore: fixed a typo

* chore: updated log in build gradle

* fix: item color setting in android

* fix: tab styling when no css aplied

* chore: private methods renamed

* tests: added selected-item test pages

* chore: renamed test pages

* chore: move css-tree package to the right place

* tests: added new ui tests

* fix: use renamed function

* fix: set item color

* tests: aded automationText attribute

* tests: trying to fix the tests

Co-authored-by: Dimitar Topuzov <dtopuzov@gmail.com>

api-reports/NativeScript.api.md

@@ -2225,8 +2225,12 @@ export class TabNavigationBase extends View {
 
     getTabBarItemTextTransform(tabStripItem: TabStripItem): any
 
+    getTabBarSelectedItemColor(): Color
+
     getTabBarTextTransform(): any
 
+    getTabBarUnSelectedItemColor(): Color
+
     ios: any /* UITabBarController */;
 
     items: Array<TabContentItem>;
@@ -2266,8 +2270,12 @@ export class TabNavigationBase extends View {
 
     setTabBarItemTitle(tabStripItem: TabStripItem, value: any): any
 
+    setTabBarSelectedItemColor(value: Color)
+
     setTabBarTextTransform(value: any): void
 
+    setTabBarUnSelectedItemColor(value: Color)
+
     tabStrip: TabStrip;
 }
 
@@ -2320,6 +2328,10 @@ export class TabStrip extends View {
     on(eventNames: string, callback: (data: EventData) => void, thisArg?: any);
 
     on(event: "itemTap", callback: (args: TabStripItemEventData) => void, thisArg?: any);
+
+    selectedItemColor: Color;
+
+    unSelectedItemColor: Color;
 }
 
 // @public