partition: add *_follow_default optional params

Add optional parameters inside init function of partition. Optional
parameters refer to:

- partno_follow_default
- start_follow_default
- end_follow_default

These options can be used in order to enable or disable default partno,
start and end value when adding partitions.

With those optional parameters enabled by default a user is able
to add a partition into the context label without specifying any
attribute.

>>> import fdisk
>>> cxt = fdisk.Context('./disk.bin', readonly=False)
>>> cxt.create_disklabel('gpt')
>>> pa = fdisk.Partition()
>>> cxt.add_partition(pa)

This enables:

- "Filling" the rest of the disk with last partition
- No need to track start/end sector for any following partition
- No need to track next partno number for any following partition

See:

https://cdn.kernel.org/pub/linux/utils/util-linux/v2.34/libfdisk-docs/libfdisk-Partition.html#fdisk-partition-partno-follow-default
https://cdn.kernel.org/pub/linux/utils/util-linux/v2.34/libfdisk-docs/libfdisk-Partition.html#fdisk-partition-start-follow-default
https://cdn.kernel.org/pub/linux/utils/util-linux/v2.34/libfdisk-docs/libfdisk-Partition.html#fdisk-partition-end-follow-default

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