Add fillDescription to PopConAnalyzer

[tvami]

Discussed in #40817 (comment)

• define the fillDescriptions(edm::ConfigurationDescriptions& descriptions) functions in popcon::PopConAnalyzer<S>
• define fillPSetDescription(edm::ParameterSetDescription& desc) in LHCInfoPerFillPopConSourceHandler and LHCInfoPerLSPopConSourceHandler
• make popcon::PopConAnalyzer<S>::fillDescriptions() call S::fillPSetDescription()
  • it follows that either all S must have fillPSetDescription() implemented, or one adds code in popcon::PopConAnalyzer<S>::fillDescriptions() to have different behavior based on S having fillPSetDescription() or not

[tvami]

assign db

[cmsbuild]

New categories assigned: db

@francescobrivio,@saumyaphor4252,@tvami you have been requested to review this Pull request/Issue and eventually sign? Thanks

[cmsbuild]

A new Issue was created by @tvami Tamas Vami.

@Dr15Jones, @perrotta, @dpiparo, @rappoccio, @makortel, @smuzaffar can you please review it and eventually sign/assign? Thanks.

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