Add example of ConditionAccessorHolder implementation for integration in Functional

this is an example of implementation of the ConditionAccessorHolder concept LHCb is going to use to migrate the detector description to DD4hep.

While it's not Gaudi specific and experiments are required to provide a specific implementation of it, the example is needed to be able to integrate the functionality in Gaudi::Functional (as opt in).

• doxygen comments

CC: @graven

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marked the checklist item doxygen comments as completed

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• 06730208 - Fix compilation with gcc6.2 + c++14

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mentioned in merge request lhcb/LHCb!1732 (merged)

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@clemenci: why not just unWIP this, and subsequently merge it? I'd like to then add the small bit of scaffolding to make it easy to declare the relevant handle to the Functional (i.e. add an ADL-findable get and getKey with the right signature) to ConditionAccessor. At that point this will be a neat little example of how to add a completely new store! (which will be very useful for an evolution of !810 which won't be constrained by IDataManagerSvc, and can thus avoid using AnyDataWrapper)

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unmarked as a Work In Progress

• [2019-05-15 00:03] Validation started with lhcb-dd4hep#178
• [2019-05-15 00:04] Validation started with lhcb-lcg-dev4#901
• [2019-05-15 00:05] Validation started with lhcb-lcg-dev3#893
• [2019-05-15 00:05] Validation started with lhcb-sanitizers#246
• [2019-05-15 00:05] Validation started with lhcb-soa-track#78
• [2019-05-15 00:06] Validation started with lhcb-tdr-test#546
• [2019-05-15 00:07] Validation started with lhcb-test-throughput2#8
• [2019-05-15 00:10] Validation started with lhcb-gaudi-head#2253
• [2019-05-15 08:09] Validation started with lhcb-gaudi-merge#747
• [2019-05-16 00:03] Validation started with lhcb-sanitizers#247
• [2019-05-16 00:03] Validation started with lhcb-soa-track#79
• [2019-05-16 00:03] Validation started with lhcb-lcg-dev4#902
• [2019-05-16 00:03] Validation started with lhcb-test-throughput2#9
• [2019-05-16 00:04] Validation started with lhcb-dd4hep#179
• [2019-05-16 00:05] Validation started with lhcb-lcg-dev3#894
• [2019-05-16 00:06] Validation started with lhcb-tdr-test#547
• [2019-05-16 00:09] Validation started with lhcb-gaudi-head#2254

assigned to @leggett

mentioned in merge request !878 (merged)