Add Apache Spark within CMEM BUILD documentation #212
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Description
Adds a new documentation page that explains Apache Spark in general terms and documents how Spark is used within Corporate Memory’s BUILD component. It covers Spark’s main abstractions (RDDs, DataFrames), the rationale for using Spark in BUILD, what “Spark-aware datasets” are (and which types exist), and how Spark-backed workflow execution relates to the Knowledge Graph (Spark computes in BUILD; EXPLORE persists; the workflow execution engine mediates).
Context
This documentation complements the plugin documentations in and from BUILD itself.