Support for adding new metrics when reindexing

[sandeep217]

Reindexing/rollup task using "ingestSegment" firehose doesn't let you add additional metrics. I have a use case where i want to drop some dimensions and convert a few dimensions to hyperUnique metrics. My reindex task completes but the new hyper unique metrics all have 0 value. Not sure if this is a bug or missing feature.

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