Historical: add basin mask for basin specific diagnostics

[blimlim]

Closes the historical half of #95.

This PR sets MOM to read the basin_mask.nc input file which allows for basin specific tracer diagnostics (e.g. temp_merid_flux_over_atlantic) to be saved.

[aidanheerdegen]

LGTM.

Just checking: are there are diagnostics in the standard profiles that use the basin mask?

[blimlim]

are there are diagnostics in the standard profiles that use the basin mask?
There are! We're currently saving several of these 1D flux variables incorrectly because of the missing basin mask:

access-esm1.5-configs/ocean/diagnostic_profiles/source_yaml_files/diag_table_standard_source.yaml

Lines 361 to 410 in 475e222

	'monthly 1d ocean fields':
	defaults: # these can be overridden for individual fields below
	file_name_dimension: 1d # descriptor for filename, e.g. 3d, 2d, scalar
	output_freq: 1 # integer: output sampling frequency in output_freq_units (0: every timestep; -1: only at end of run)
	output_freq_units: months # time units for output: years, months, days, hours, minutes, or seconds
	file_name:
	- file_name_prefix
	- file_name_dimension
	- output_freq
	- '':
	- output_freq_units
	- file_name_date
	fields:
	geolat_c: {reduction_method: 'snap'} # See https://github.com/ACCESS-NRI/access-esm1.5-configs/issues/74
	temp_merid_flux_advect_global:
	temp_merid_flux_over_global:
	temp_merid_flux_gyre_global:
	salt_merid_flux_advect_global:
	salt_merid_flux_over_global:
	salt_merid_flux_gyre_global:
	temp_merid_flux_advect_southern:
	temp_merid_flux_over_southern:
	temp_merid_flux_gyre_southern:
	salt_merid_flux_advect_southern:
	salt_merid_flux_over_southern:
	salt_merid_flux_gyre_southern:
	temp_merid_flux_advect_atlantic:
	temp_merid_flux_over_atlantic:
	temp_merid_flux_gyre_atlantic:
	salt_merid_flux_advect_atlantic:
	salt_merid_flux_over_atlantic:
	salt_merid_flux_gyre_atlantic:
	temp_merid_flux_advect_pacific:
	temp_merid_flux_over_pacific:
	temp_merid_flux_gyre_pacific:
	salt_merid_flux_advect_pacific:
	salt_merid_flux_over_pacific:
	salt_merid_flux_gyre_pacific:
	temp_merid_flux_advect_arctic:
	temp_merid_flux_over_arctic:
	temp_merid_flux_gyre_arctic:
	salt_merid_flux_advect_arctic:
	salt_merid_flux_over_arctic:
	salt_merid_flux_gyre_arctic:
	temp_merid_flux_advect_indian:
	temp_merid_flux_over_indian:
	temp_merid_flux_gyre_indian:
	salt_merid_flux_advect_indian:
	salt_merid_flux_over_indian:
	salt_merid_flux_gyre_indian:

as brought up here: https://forum.access-hive.org.au/t/access-esm1-5-basin-ocean-heat-transports-incorrect/3674