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>

tns-core-modules-widgets/android/widgets/build.gradle

@@ -71,9 +71,9 @@ android {
 
 dependencies {
     implementation fileTree(include: ['*.jar'], dir: 'libs')
-    
+
     if(project.hasProperty("useAndroidX")) {
-        println 'Using androix'
+        println 'Using android X'
         def androidxVersion = computeAndroidXVersion()
         implementation 'androidx.viewpager:viewpager:' + androidxVersion
         implementation 'androidx.fragment:fragment:' + androidxVersion