Improve compaction mechanism

[yosukehara]

• Able to gradually compact data
  • Assignable data-compaction target raw-file(s)
• Able to suspend/resume compaction
  • Need to implement commands of compact status, compact suspend, compact resume and compact start in LeoFS-Manager

[yosukehara]

• leo_object_storage
  • https://github.com/leo-project/leo_object_storage/commit/8f0180870f213ffd1b47d8eef88176cb83dadf87
  • https://github.com/leo-project/leo_object_storage/commit/c9d2be5da03c620d7f7abd9cee29c91175bc72d8
  • https://github.com/leo-project/leo_object_storage/commit/37d31722be551bab34f30ae1f2aff0f8096b9229
  • https://github.com/leo-project/leo_object_storage/commit/970fe8b3f2d49f65783381a2f5d3e34059c6f1b9
  • https://github.com/leo-project/leo_object_storage/commit/5736e416bf89525020c5b1907fa169dcdc033d7d
  • https://github.com/leo-project/leo_object_storage/commit/d02f7fe5150d29d543a52e85cd9ff4a4c5f845e4
  • https://github.com/leo-project/leo_object_storage/commit/1fcf64adcc513520e1bdfffff2a73cab0c950a9a

[yosukehara]

• leo_storage
  • https://github.com/leo-project/leo_storage/commit/347fcddc88e24cb5b8650bd0f83ceb9519acf812

[yosukehara]

• leo_manger
  • https://github.com/leo-project/leo_manager/commit/4bf3c09d4e2597a852ed816feb5720d02d4946f3
  • https://github.com/leo-project/leo_manager/commit/840aa5dc9dc019d2876f3a289c70d0481f37b8df

[mocchira]

Done. Anyway, There are still some improvements to do, so I'll open a new ticket.