Build: Move editor related aztec version definition to root

This change also groups 'aztecVersion' to be part of the other library
related version definitions on root and has that sit closer to the
'gutenbergMobileVersion' version definition, which is also being
utilized mainly on the 'editor' module.

Author: ParaskP7

build.gradle

@@ -10,6 +10,7 @@ plugins {
 ext {
     wordPressUtilsVersion = '2.7.0'
     wordPressLoginVersion = '0.19.0'
+    aztecVersion = 'v1.6.0'
     gutenbergMobileVersion = 'v1.82.1'
     storiesVersion = '1.4.0'
     aboutAutomatticVersion = '0.0.6'

libs/editor/build.gradle

@@ -4,8 +4,6 @@ plugins {
     id "org.jetbrains.kotlin.plugin.parcelize"
 }
 
-ext.aztecVersion = 'v1.6.0'
-
 repositories {
     maven {
         url "https://a8c-libs.s3.amazonaws.com/android"