Muon Chi2Corr implementation

Includes Chi2Corr algorithm standalone and configures it as default muonID algorithm.

See https://arxiv.org/pdf/2008.01579.pdf

See also !1413 (closed)

PrChecker plots showing the working point chi2corr < 1.7 running over a JpsiMuMu sample:

Same plots running with IsMuon:

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• 2314dfc1 - Fixed formatting

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fyi @tevans @dovombru @mfontana @masantim

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• 78336f20 - actually set chi2corr by default

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• e50bb3db - actually pick muon tracks

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• 21b95ca0 - Fixed formatting

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assigned to @jhorswil

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• 52cbfc79 - undo changes in config

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mentioned in merge request !1413 (closed)

mentioned in issue Moore#708 (closed)

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• a743575d - configure displaced dimuonline to use chi2corr

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Sorry, naming of things is wildly unclear at the moment; the idea is to replaced DiMuonDisplaced with DiMuonLowMass and rename DiMuonLowMass DiMuonDisplaced (as this is what it is actually doing) but code-wise given they are basically identical algorithms it is better to only have to maintain one rather than two. See !1431 (merged) n.b. I don't think we have necessarily all converged on this being the 'right' strategy; just an FYI in case it is.