utils: Add windows_register_c_drive implementation

Add python implementation of the legacy ogWindowsRegisterPartition
function.

This function configures the system partition to be considered the
new C drive after a Windows image restore.

The drive letter configuration is stored in the SYSTEM hive of
the windows registry. The node MountedDevices contains all the
configuration as key-value pairs.
The C drive key \DosDevices\C: contains a different value based on
the partitioning type.

GPT
the value is DMIO:ID: followed by the 16 byte GUID of the
partition.
Example: DMIO:ID:\xc9\xfc\x1c\x86\x13\x11O\t\xa2\x9c{/\xf1\xdf\xe4)

MBR
The value is a little endian byte sequence with 2 parts.
The first 4 bytes correspond to the disk id. The second part is
the byte offset start of the partition in that disk.
Example: \xe1\\\x9cP\x00\x00\x10j\x18\x00\x00\x00

If we format the MBR value in a more readable way we get
e1 5c 9c 50 00 00 10 6a 18 00 00 00
In this case the disk ID is 509c5ce1.
The partition offset is 186a100000.

This patch adds the following helper functions to:

- get_disk_id_bytes(): to obtain the disk identifier.

- get_part_id_bytes(): to obtain a partition identifier as UUID
  for MBR or DMIO:ID format for GPT.

- get_sector_size(): to query the sector size of a specific disk.
  Read /sys/class/block/{device_name}/queue/hw_sector_size to obtain the value.
  This is MBR specific.

- get_partition_start_offset(): to query the start sector of a specific
  partition and disk. Use sfdisk with the -J argument to get fdisk data in
  json format. This is MBR specific.

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