[Feature]: Refactor `clisccp.py` with `handlers.yaml`

[tomvothecoder]

Is your feature request related to a problem?

clisccp.py has additional code for formulas, which need to be added to formulas.py

• Link: https://github.com/E3SM-Project/e3sm_to_cmip/blob/master/e3sm_to_cmip/cmor_handlers/vars/clisccp.py

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