chore: [V2] rename 'core' module to 'common' (#1364)

* First rename

* POM updates

* Rename namespace

* Fix

* Fix?

* More namespace changes

* Rename core examples to core utilities

* Finish renaming core utilities

* Clean up name/description of module

* More change

* Fix readme

Author: scottgerring

examples/README.md

@@ -29,9 +29,9 @@
     </description>
 
     <modules>
-        <module>powertools-examples-core/sam</module>
-        <module>powertools-examples-core/cdk/app</module>
-        <module>powertools-examples-core/cdk/infra</module>
+        <module>powertools-examples-core-utilities/sam</module>
+        <module>powertools-examples-core-utilities/cdk/app</module>
+        <module>powertools-examples-core-utilities/cdk/infra</module>
         <module>powertools-examples-idempotency</module>
         <module>powertools-examples-parameters</module>
         <module>powertools-examples-serialization</module>