Support in-transaction script caching for recursive uses of uncacheable scripts

[AFaust]

In situations where uncacheable scripts may be called multiple times (loop / recursion), a memory problem can occur due to the storing of multiple compiled scripts in memory (see https://issues.alfresco.com/jira/browse/ALF-9981). To improve the default caching behavior and reduce the memory footprint of the script processors, globally-uncacheable scripts should at least be cached within the transaction / request context scope.