Optimised DataBuilderMeta method calls

[r0goyal]

Current DataBuilderMeta has two methods which are called extensively by SimpleDataFlowExecutor

1. getEffectiveConsumes() - This returns list of dataset effectively consumed by the builder. Once builderMeta has been initialised, this set cannot change in runtime and hence output of this method (a set) can be cached instead of creating a new set every time
2. getAccessibleDataSet() - Similar logic applies for this as well

To achieve this, it became mandatory to make DataBuilderMeta immutable. Currently only rank was set from outside after deepCopy(). deepCopy() has now been modified to accept rank as input effectively making DataBuilderMeta immutable throughout its lifecycle

Now once this object became immutable, another performance optimisation can be unlocked. There is a frequent map lookup for DataBuilderMeta during execution in a map. Given the immutability, hashCode() for DataBuilderMeta can now be cached and need not be computed on every invocation

[coderabbitai]

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