First version of Muon geometry and conditions compatible with dd4hep

added lhcb-dd4hep lhcb-gaussino labels

/ci-test

[2022-04-08 00:04] Automatic merge failed in [lhcb-dd4hep#1091](https://lhcb-nightlies.web.cern.ch/nightly/lhcb-dd4hep/1091/Detector/checkout
[2022-04-08 00:18] Automatic merge failed in [lhcb-gaussino-new-cmake#134](https://lhcb-nightlies.web.cern.ch/nightly/lhcb-gaussino-new-cmake/134/Detector/checkout
[2022-04-08 00:18] Automatic merge failed in [lhcb-gaussino-fastsim#251](https://lhcb-nightlies.web.cern.ch/nightly/lhcb-gaussino-fastsim/251/Detector/checkout
[2022-04-08 00:19] Automatic merge failed in [lhcb-gaussino#1196](https://lhcb-nightlies.web.cern.ch/nightly/lhcb-gaussino/1196/Detector/checkout
[2022-04-08 21:21] Validation started with lhcb-master-mr#4205
[2022-04-09 00:04] Validation started with lhcb-dd4hep#1092
[2022-04-09 00:07] Validation started with lhcb-gaussino-fastsim#252
[2022-04-09 00:07] Validation started with lhcb-gaussino-new-cmake#135
[2022-04-09 00:08] Validation started with lhcb-gaussino#1197
[2022-04-12 00:03] Validation started with lhcb-dd4hep#1093
[2022-04-12 00:14] Validation started with lhcb-gaussino-fastsim#253
[2022-04-12 00:15] Validation started with lhcb-gaussino-new-cmake#136
[2022-04-12 00:16] Validation started with lhcb-gaussino#1198
[2022-04-13 00:19] Validation started with lhcb-gaussino-new-cmake#137
[2022-04-13 00:19] Validation started with lhcb-gaussino-fastsim#254
[2022-04-13 00:21] Validation started with lhcb-gaussino#1199

added 84 commits

3e116ea8...9bcfd500 - 83 commits from branch master
b6874fe8 - Merge remote-tracking branch 'origin/master' into MuonMergeGeoCond

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marked this merge request as ready

added ci-test-triggered label

added 1 commit

8fc141e7 - merged to master

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added 1 commit

6faec40e - add constant in Muon_debug

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resolved all threads

/ci-test

added hlt2-throughput-decreased label

I've made an attempt to fix the compilation of DD4hep based code with this MR, but I've discovered that this is changing the interface of the DeMuon. Some methods (e.g. stations) have completely change meaning and signature. This is not possible as we need to be backward compatible with DetDesc for some time. In particular the algorithms using DeMuon need to be able to call the same methods in DetDesc and DD4hep. This has to be fixed, either by changing DD4hep's interface and mimicing DetDesc or by changing the DetDesc interface and adapting all client algorithms.

Now, this being extremely urgent (that is preventing any further progress on DD4hep right now), I propose to modify this MR so that things are compiling even if they are not fully functional. We can then fix remaining issues in a further MR. What do you think ?

@satta @sponce I am going to remove the lhcb-dd4hep label here, as this MR is breaking the LHCb build (for the reasons above I presume) and I want to test something else in this slot over night. Hope thats OK ?