Page Comparison

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1. LookupKV interface 

   Code Block
   Object lookup(String key); Map<String, Object> multiLookup(String[] key);

2. Implement LookupKV in KeyValueTable and ObjectMappedTable
3. ScriptTransform changes

   1. Add configuration property for declaring lookup tables to use, properties for each table (e.g. dataset properties)

      Code Block
      "lookupTables": [ {"name":"purchases", "dataset":"purchases", "datasetProperties": {..}, "enable.cache":"true", "cache.expiry":1234}, {"name":"ip2geo", "file":"/data/ip2geo.csv"} ]

   2. configure(): verify datasets / tables exist
   3. transform(): execute lookup methods in a transaction, provide LookupKV instance to script

      1. Options usage for lookup usage: 

         Code Block
         var result = context.getTable("purchases").lookup(user); // or var result = tables["purchases"].lookup(user); // or var result = purchases.lookup(user);

      2. Options for multiLookup usage:

         Code Block
         var result = purchases.multiLookup(["alice", "bob"]); // do something with result["alice"] // do something with result["bob"]

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