[O2-5295] DPL Analysis: introduce aod-writer-df-offset option

[aalkin]

Introduces --aod-writer-df-offset N option that makes dataframes numbers start from N+1. Can also be set in writer configuration JSON file as 'offset'.

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[jgrosseo]

I just posted comments on the related JIRA ticket which may be relevant...

The DF/TF number is internally available and some task may grab it and use it for something. In this case the number will be different in the file than during the current processing. Why we do not set it before generation?

[jgrosseo]

Discussion continues on https://its.cern.ch/jira/browse/O2-5295

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[aalkin]

Replaced by #13711