CREST data dump option added for IOVDbSvc

Mikhail Mineev requested to merge mmineev/athena:23.0-mvg-08 into 23.0

This update realizes a possibility to store the data received from CREST server to the hard disk. The data will be written in the current local directory, where you run your code in the ./crest_data subfolder. To run this dump you need to add in the python codes a line:

acc.getService("IOVDbSvc").CrestToFile = True

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