LazyConsistentBlob/LazyMirroredBlob

[lixinqi]

[lixinqi]

ConsistentBlob派生出LazyConsistentBlob和EagerConsistentBlob MirroredBlob派生出LazyMirroredBlob和EagerMirroredBlob

[CLAassistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you all sign our Contributor License Agreement before we can accept your contribution.
3 out of 7 committers have signed the CLA.

:white_check_mark: simonJJJ
:white_check_mark: lixinqi
:white_check_mark: leaves-zwx
:x: JamiePlur
:x: hsj0429
:x: nlqq
:x: Dounm
_{You have signed the CLA already but the status is still pending? Let us recheck it.}