There are a number of reasons why we may want to serialize/deserialize large objects: distributed caching, site archiving, session failover, etc.
Provide methods in Entity API to support. (this refers to the legacy super thick Entity classes)
There will probably be hooks into EB as well.
We want to get this done before Sakai 10 (at least the API portions, implementations will take longer)
NOTE: this is ONLY for the API portions and the kernel scaffolding to support rebuild/breakdown and Session clustering, the actual impls will be separate