Move PMTBeamSignal data product from icaruscode to sbnobj

[aheggest]

This pull request (together with sbnobj PR #130) moves the PMTBeamSignal data product from icaruscode/IcarusObj to a SBN common area, sbnobj/Common. This enables the special RWM signals digitized by the PMTs to be read into the CAFs.

The main changes in this PR are switching all icarus::timing::PMTBeamSignal --> sbn::timing::PMTBeamSignal and removing the previous defintion in PMTBeamSignal.h.

This PR is a part of a PR pair:

• icaruscode PR #832
• sbnobj PR #130

To fully get the information into the CAFs, sbncode PR#541 and sbnanaobj PR#141 should also be merged in, but this icaruscode PR #832 and sbnobj PR #130 do not rely on sbncode PR#541 and sbnanaobj PR#141.

Added a simple producer module PMTBeamSignalNameSpaceConverter_module.cc to convert the PMTBeamSignal from icarus::timing namespace to sbn::timing. This is to help with backward compatibility for files that were produced with icarus::timing::PMTBeamSignal - we can convert the data product to the correct sbn::timing namespace needed to be read into the CAFs.

[mvicenzi]

This looks pretty straighforward, but I have just two minor comments below.

[mvicenzi]

Few more comments on the recent additions.
The most important is making the namespace converter more general to be able to handle both RWM and EW products. There is no current need for it, but you never know.

[leoaliaga]

trigger build larsoft@v10_06_00 LArSoft/lar*@LARSOFT_SUITE_v10_06_00 SBNSoftware/sbnalg@v10_06_00_01 SBNSoftware/sbncode@v10_06_00_01 SBNSoftware/sbnobj#130

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✔️ CI build for LArSoft Succeeded on slf7 for c14:prof -- details available through the CI dashboard

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✔️ CI build for LArSoft Succeeded on slf7 for e26:prof -- details available through the CI dashboard

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❌ CI build for ICARUS Failed at phase build ICARUS on slf7 for c14:prof -- details available through the CI dashboard

🚨 For more details about the failed phase, check the build ICARUS phase logs

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❌ CI build for ICARUS Failed at phase ci_tests ICARUS on slf7 for e26:prof -- details available through the CI dashboard

🚨 For more details about the failed phase, check the ci_tests ICARUS phase logs

parent CI build details are available through the CI dashboard