Handle garbage collection of the pod instances.

Note: This namespace is an implementation detail and is not needed unless you are extending bbssh itself.

Keywords are not passed across the pod boundary as they interfere with garbage collection. Instead the pod and the client interface with values that are a vector of two strings: A string representing the namespace or the java package and a string representing the name or class name.

The client recieves a transient keyword constructed by register. When this passed out of scope it is garbage collected by babashka and this triggers a deletion of the instance it refers to from the pod’s heap.

Before sending this keyword as a reference to the pod invoke, use split-key to translate it to the reference vector used by the pod.