Add the shop module to the migration process.

Shop migration should be part of the main migration process (STK) due to the Script logic. If we perform first the STK migration and then the Form migration, we lost all references of the migrated templates and we are no more able to rename the templates/areas....
So like for Form migration, we have to perform this migration at the same time as STK.

Like for Form, PUR,... let the shop module be migrated and configured by the main migration process.

Add a specific ExtraShopTasks.groovy file that will handle the areas references.
Add options for this module in the Configuration.groovy file
Add sections that handle the specific Shop migration steps in the ConfiguredMigration.groovy file.