Add blkid's serialize api's.

[sanebay]

No description provided.

[codecov-commenter]

Codecov Report

Attention: 4 lines in your changes are missing coverage. Please review.

Comparison is base (bd80010) 56.14% compared to head (8daf56a) 69.08%.
Report is 3 commits behind head on master.

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Additional details and impacted files

@@             Coverage Diff             @@
##           master     #196       +/-   ##
===========================================
+ Coverage   56.14%   69.08%   +12.93%     
===========================================
  Files         108       93       -15     
  Lines        9676     7546     -2130     
  Branches     1199      966      -233     
===========================================
- Hits         5433     5213      -220     
+ Misses       3768     1872     -1896     
+ Partials      475      461       -14     

Files	Coverage Δ
src/include/homestore/blk.h	71.73% <ø> (ø)
src/include/homestore/blkdata_service.hpp	100.00% <ø> (ø)
src/include/homestore/index_service.hpp	50.00% <ø> (+50.00%)	⬆️
src/include/homestore/logstore_service.hpp	100.00% <ø> (+66.66%)	⬆️
src/include/homestore/meta_service.hpp	100.00% <ø> (ø)
src/lib/blkdata_svc/blkdata_service.cpp	41.34% <ø> (ø)
src/lib/checkpoint/cp_mgr.cpp	77.77% <100.00%> (+12.51%)	⬆️
src/lib/common/resource_mgr.hpp	100.00% <ø> (ø)
src/lib/device/physical_dev.cpp	80.34% <100.00%> (+1.61%)	⬆️
src/lib/homestore.cpp	86.74% <100.00%> (+13.45%)	⬆️
... and 6 more

... and 62 files with indirect coverage changes

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