CP algorithms: Electron trigger SF calculation improvements

Standalone electron trigger SF calculation in CP algorithms improvements:

• make HLT prefix configurable
• make output prefixes configurable - useful if multiple WPs are covered (alternatively we could somehow add ID to the name, but current implementation allows more flexibility)
• support all years for uniform branches - this currently only works either only for Run 2 or for Run 3, I hope this is acceptable
• add ability to save output with tool key name as it makes the key the same for a Run
• add a helper function to properly differentiate trilepton legs with others
• adds extra e-tau (and mu-tau to avoid too many iterations) triggers that were missing

Keeping as draft for now to get feedback but to allow more testing.

/cc @tstreble @jedebevc @ravinab @jmaurer