context: add size_unit getset

Size unit can be get or set using 'size_unit' context member.

>>> for pa in cxt.partitions:
...     cxt.partition_to_string(pa, fdisk.FDISK_FIELD_SIZE)
...
'114.6G'
>>> cxt.size_unit
0
>>> cxt.size_unit == fdisk.FDISK_SIZEUNIT_HUMAN
True
>>> cxt.size_unit = fdisk.FDISK_SIZEUNIT_BYTES
>>> for pa in cxt.partitions:
...     cxt.partition_to_string(pa, fdisk.FDISK_FIELD_SIZE)
...
'123010531328'

Use fdisk_get_size_unit to get size unit value.
https://cdn.kernel.org/pub/linux/utils/util-linux/v2.34/libfdisk-docs/libfdisk-Context.html#fdisk-get-size-unit

Use fdisk_set_size_unit to set size unit value.
https://cdn.kernel.org/pub/linux/utils/util-linux/v2.34/libfdisk-docs/libfdisk-Context.html#fdisk-set-size-unit

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