Implement the new clouddatastore

[HenryGeorgist]

[HenryGeorgist]

create interfaces for the event datastore
implement the event data store with tiledb

[rgoss]

Initial implementations for golang and java are available. Not telling you anything you don't already know, but the initial implementation is fairly low level and implemented as a "MultiDimensionalArrayStore" using TileDB. Both implementations also include a "SimpleArrayStore" implementation which is just a simplification of the MultiDimesionalArrayStore limited to one numeric attribute at each array index location. Finally a proof of concept of a RecordsetStore was also implemented for both SDKs. The RecordsetStore was designed to take recordsets from something like HDF5 compound records and insert them in a single operation into an array store, and then allow queries of the recordset to be scanned directly into Java Classes or Golang Structs.