CP algorithms: Add rename output command and allow all commands to be optional

Improvements to the CP algorithms output commands:

• allow commands to be optional (if they are specific to sample, LHC run or something else)
• add a rename command that used re.sub

Example:

Output:
  commands:
  - optional rename el_charge_misid_effSF_(.*) el_effSF_Chflip_\1

Note that this is for now fully backwards compatible. We may consider in the future to add another keyword only_MC or something similar to also validate commands for data.

/cc @krumnack @ravinab @tstreble @holau