[PWGEM] Add histograms and checks for Hb->DmesonType->e

[feisenhu]

Adding additional histograms and signal selections in which it is distinguished between different type of charm hadrons in the decay of Hb -> Hc -> e

[alibuild]

Error while checking build/O2Physics/o2 for c15daa3 at 2026-01-29 16:52:

## sw/BUILD/O2Physics-latest/log
/sw/SOURCES/O2Physics/14698-slc9_x86-64/0/PWGEM/Dilepton/Tasks/checkMCTemplate.cxx:671:42: error: 'kDPlus' was not declared in this scope; did you mean 'o2::constants::physics::kDPlus'?
/sw/SOURCES/O2Physics/14698-slc9_x86-64/0/PWGEM/Dilepton/Tasks/checkMCTemplate.cxx:674:42: error: 'kD0' was not declared in this scope; did you mean 'o2::constants::physics::kD0'?
/sw/SOURCES/O2Physics/14698-slc9_x86-64/0/PWGEM/Dilepton/Tasks/checkMCTemplate.cxx:676:42: error: 'kDS' was not declared in this scope; did you mean 'o2::constants::physics::kDS'?
/sw/SOURCES/O2Physics/14698-slc9_x86-64/0/PWGEM/Dilepton/Tasks/checkMCTemplate.cxx:678:42: error: 'kLambdaCPlus' was not declared in this scope; did you mean 'o2::constants::physics::kLambdaCPlus'?
/sw/SOURCES/O2Physics/14698-slc9_x86-64/0/PWGEM/Dilepton/Tasks/checkMCTemplate.cxx:680:42: error: 'kXiC0' was not declared in this scope; did you mean 'o2::constants::physics::kXiC0'?
/sw/SOURCES/O2Physics/14698-slc9_x86-64/0/PWGEM/Dilepton/Tasks/checkMCTemplate.cxx:682:42: error: 'kXiCPlus' was not declared in this scope; did you mean 'o2::constants::physics::kXiCPlus'?
ninja: build stopped: subcommand failed.

Full log here.

[alibuild]

Auto-approving on behalf of @feisenhu.