MAM4xx: Add reader for season_wes, which is part of the microphysics interface.

[odiazib]

We use the scream_scorpio interface to read the variable season_wes from the NC file:

${DIN_LOC_ROOT}/atm/scream/mam4xx/drydep/season_wes.nc

netcdf season_wes {
dimensions:
    lat = 360 ;
    pft = 11 ;
    time = UNLIMITED ; // (12 currently)
variables:
    float lat(lat) ;
        lat:long_name = " " ;
        lat:units = " " ;
    int season_wes(time, pft, lat) ;
        season_wes:long_name = " " ;
        season_wes:units = " " ;
}

The variable season_wes along with latitude from the host model is used to compute index_season_lai.

We have ported the block of code to compute index_season_lai in the mam4xx routine find_season_index. see PR 361

[mergify]

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[singhbalwinder]

Left very minor comments. Overall looks great!