Page Comparison

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1. Operations
   1. Perform single + batch read on single + multiple dataset from script transform
   2. Perform single + batch read on DistributedCache from script transform
2. Supported datasets for lookup
   1. Key-value table
   2. ObjectMappedTable
3. Optional caching with time-based expiration

Proposed changes

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1. Rename TransformContext to StageContext (since it is used as the base context in BatchRuntimeContext, not only transform contexts).
2. Create TransformContext which extends StageContext
   1. Has a single method: Lookup getLookup()

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Design

1. LookupKV interface
   1. Object read(String key);
2. ScriptTransform
   1. New configuration property for declaring lookup tables to use
   2. At configure(), verify datasets / tables exist