DPL: make addInputs support anything which provides base_specs

[ktf]

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• DPL: adapt reconstruction CCDB Fetcher to use the new CCDBFetcherHelper #14593
• DPL Analysis: centralised CCDB support in analysis #14567
• -> DPL: make addInputs support anything which provides base_specs #14575

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[ktf]

@aalkin is anything actually using requestInputs? I could not find anything in O2Physics and O2.

[aalkin]

@ktf it should be used in AnalysisTask.h, through AnalysisManagers.h, and it applies for the Spawns<> and Builds<> declarations.

[ktf]

Found...