Resolve NXCALS-6711 "Merge small daily partitions into bigger ones"

Merge request template

COMPATIBILITY NOTE

Please make sure that this change is BACKWARDS COMPATIBLE and a new server will work correctly with clients using old APIs versions.

It may be that data sent in the new format will break the old clients.

In case of any potential incompatibility we have to inform our clients and schedule release & deployment with them.

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@acc-logging-team - please have a look for approval.

Analysis classes for merging monthly data into one file. Not very successful but keeping them for reference. Please just accept, no reviewing is necessary here.

Closes NXCALS-6711