Adding custom tables for ETCCDI indices (#2442)

Co-authored-by: Elizaveta Malinina <[email protected]>

Author: malininae

esmvalcore/cmor/tables/custom/CMOR_rx1day.dat

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+SOURCE: CMIP6
+!============
+variable_entry:    rx1day
+!============
+modeling_realm:    ground
+frequency: yr
+!----------------------------------
+! Variable attributes:
+!----------------------------------
+standard_name:
+units:             mm
+cell_methods:      time: sum within days time: maximum over days 
+cell_measures:     area: areacella
+long_name:         Annual/monthly maximum 1-day precipitation
+comment:           ETCCDI (Extreme climate change index) annual/monthly maximum 1-day precipitation
+!----------------------------------
+! Additional variable information:
+!----------------------------------
+dimensions:        longitude latitude time
+type:              real
+!----------------------------------
+!

esmvalcore/cmor/tables/custom/CMOR_rx5day.dat

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+SOURCE: CMIP6
+!============
+variable_entry:    rx5day
+!============
+modeling_realm:    ground
+frequency: yr
+!----------------------------------
+! Variable attributes:
+!----------------------------------
+standard_name:
+units:             mm
+cell_methods:      time: sum within days time: maximum over days 
+cell_measures:     area: areacella
+long_name:         Annual/monthly maximum 5-day precipitation
+comment:           ETCCDI (Extreme climate change index) annual/monthly maximum 5-day precipitation
+!----------------------------------
+! Additional variable information:
+!----------------------------------
+dimensions:        longitude latitude time
+type:              real
+!----------------------------------
+!

esmvalcore/cmor/tables/custom/CMOR_tnn.dat

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+SOURCE: CMIP6
+!============
+variable_entry:    tnn
+!============
+modeling_realm:    ground
+frequency: yr
+!----------------------------------
+! Variable attributes:
+!----------------------------------
+standard_name:
+units:             degrees_C
+cell_methods:      time: minimum
+cell_measures:     area: areacella
+long_name:         Annual/monthly minimum value of daily minimum temperature
+comment:           ETCCDI (Extreme climate change index) annual/monthly minimum value of daily minimum temperature
+!----------------------------------
+! Additional variable information:
+!----------------------------------
+dimensions:        longitude latitude time
+type:              real
+!----------------------------------
+!

esmvalcore/cmor/tables/custom/CMOR_txx.dat

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+SOURCE: CMIP6
+!============
+variable_entry:    txx
+!============
+modeling_realm:    ground
+frequency: yr
+!----------------------------------
+! Variable attributes:
+!----------------------------------
+standard_name:
+units:             degrees_C
+cell_methods:      time: maximum
+cell_measures:     area: areacella
+long_name:         Annual/monthly maximum value of daily maximum temperature
+comment:           ETCCDI (Extreme climate change index) annual/monthly maximum value of daily maximum temperature
+!----------------------------------
+! Additional variable information:
+!----------------------------------
+dimensions:        longitude latitude time
+type:              real
+!----------------------------------
+!