DistExec API should not require a distributed cache

The current DistExec API has the limitation that it requires a distributed cache to choose the nodes on which it runs the code.
The distexec API should instead be based off the DefaultCacheManager.

Additionally, the API could be redesigned and possibly take inspiration from the streams API (i.e. lambdas, etc)

cacheManager.cluster().execute(<lambda>)

Add fluent methods to filter nodes by address, etc.