Updates related to Grell Friedas convection fix

[lizziel]

Name and Institution (Required)

Name: Lizzie Lundgren
Institution: Harvard University

Describe the update

1. Added meteorology source name to GCHP run directory geoschem_config.yml
2. Created new Input_Opt logical for whether to reconstruct convective precipitation flux. This switch is set automatically during run-time to true for GEOS-IT, true for GEOS-FP if start date is June 1 2020 or later, and false for all other cases.
3. Used the new Input_Opt logical to tap into the code @yuanjianz implemented in this branch already.
4. Added a warning during run directory creation about the convection scheme change and the precipitation flux bug (only if selecting GEOS-FP meteorology). This warning stops run directory creation and requires acknowledgement from the user to continue.
5. Updated change log for updates by both me and @yuanjianz.

Expected changes

I will update the main PR description after merge to reflect that me and Viral as contributors and further describe the updates.

Related Github Issue

These changes are the implementation agreed upon in geoschem#2469.