Allow partitioning by ANTENNA1

[tnakazato]

Antenna partition only processes autocorrelation, i.e., all cross-correlation data will be discarded. So it is useful only for single-dish data processing.

This is related to Issue #9. Please note that this is a draft PR just to show you an idea on what is actually requested in #9 (please see below for missing development items). Point is to allow separating data per antenna both on memory and disk.

This PR allows to set "ANTENNA1" to partition_scheme. If "ANTENNA1" is specified, processing set is separated by antenna and each processing set includes only auto-correlation data.

convert_msv2_to_processing_set(
    in_file=in_file,
    out_file=out_file,
    partition_scheme=['FIELD_ID', 'ANTENNA1'],
    parallel=False,
    overwrite=True,
)

The above command will produce more granular processing sets separated by antenna and ANTENNA_ID will be shown in the log message like below.

[2024-08-09 15:09:41,986]     INFO      client:  Partition scheme that will be used: ['DATA_DESC_ID', 'OBS_MODE', 'OBSERVATION_ID', 'FIELD_ID', 'ANTENNA1'] 
[2024-08-09 15:09:43,453]     INFO      client:  Number of partitions: 156 
[2024-08-09 15:09:43,453]     INFO      client:  OBSERVATION_ID [0], DDI [0], STATE [10], FIELD [1], SCAN [ 2  4  6  8 10 12], ANTENNA [0] 
[2024-08-09 15:09:43,895]     INFO      client:  OBSERVATION_ID [0], DDI [0], STATE [10], FIELD [1], SCAN [ 2  4  6  8 10 12], ANTENNA [1] 
[2024-08-09 15:09:44,318]     INFO      client:  OBSERVATION_ID [0], DDI [0], STATE [10], FIELD [1], SCAN [ 2  4  6  8 10 12], ANTENNA [2] 
[2024-08-09 15:09:44,744]     INFO      client:  OBSERVATION_ID [0], DDI [0], STATE [11], FIELD [1], SCAN [ 2  4  6  8 10 12], ANTENNA [0] 
[2024-08-09 15:09:45,188]     INFO      client:  OBSERVATION_ID [0], DDI [0], STATE [11], FIELD [1], SCAN [ 2  4  6  8 10 12], ANTENNA [1] 
[2024-08-09 15:09:45,611]     INFO      client:  OBSERVATION_ID [0], DDI [0], STATE [11], FIELD [1], SCAN [ 2  4  6  8 10 12], ANTENNA [2]

Development is incomplete. At least, convert_msv2_to_processing_set should be updated so that,

• it creates antenna_xds that only contains selected antenna, and
• it also creates pointing_xds that only contains pointing data for selected antenna.

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