Change byte size estimate for compressed files for FileBasedSources
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Description
Consider change the estimated byte size for file based sources for better initial autoscaling (on runners which support it; currently only Dataflow). Currently the estimate is based on total size, for compressed file we could add a factor multiplier (~5) for compressed files in a blob go produce a better estimate.
Imported from Jira [BEAM-8495](https://issues.apache.org/jira/browse/BEAM-8495). Original Jira may contain additional context.
Reported by: altay.
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