module/raid: Implement rebuild struct for raid1

[juliakononov]

Descriptions:

Added implementation of the raid1 rebuild process in a first approximation.

Implement:

• (atomic_raid.h) Library with atomic operations
• (bdev_raid.h) Structure describing the rebuild process:
  • raid_atomic64 based rebuild matrix.
  • Metadata of the rebuild e.g. flags.
• Memory areas control for RAID1:
  • (bdev_raid.c) Rebuild struct allocation.
  • (raid1.c) Correct processing of IO requests.
• Checking for compliance with the code style adopted in the project.

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Plans

• implement rebuild structure and interaction with it in RAID5.
• automate tests.