Add submit_io_batch api in blk service

[sanebay]

Use submit_io_batch when part_of_batch is set to true for read/write.

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 67.18%. Comparing base (1a0cef8) to head (6234452).
Report is 198 commits behind head on master.

Files with missing lines	Patch %	Lines
src/lib/blkdata_svc/blkdata_service.cpp	0.00%	1 Missing ⚠️

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Additional details and impacted files

@@             Coverage Diff             @@
##           master     #725       +/-   ##
===========================================
+ Coverage   56.51%   67.18%   +10.67%     
===========================================
  Files         108      109        +1     
  Lines       10300    11980     +1680     
  Branches     1402     1663      +261     
===========================================
+ Hits         5821     8049     +2228     
+ Misses       3894     3093      -801     
- Partials      585      838      +253     

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