Provide IOManagerExecutor for use with folly::Futures library.

[szmyd]

No description provided.

[codecov-commenter]

Codecov Report

Attention: 23 lines in your changes are missing coverage. Please review.

Comparison is base (7e8d2cf) 0.00% compared to head (62f85ac) 45.24%.

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Additional details and impacted files

@@             Coverage Diff             @@
##           master      #52       +/-   ##
===========================================
+ Coverage        0   45.24%   +45.24%     
===========================================
  Files           0       54       +54     
  Lines           0     4003     +4003     
  Branches        0      474      +474     
===========================================
+ Hits            0     1811     +1811     
- Misses          0     2053     +2053     
- Partials        0      139      +139     

Files	Coverage Δ
src/include/iomgr/iomgr.hpp	79.54% <100.00%> (ø)
src/lib/iomgr.cpp	60.46% <30.00%> (ø)
src/test/test_fiber_shared_mutex.cpp	0.00% <0.00%> (ø)

... and 51 files with indirect coverage changes

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[szmyd]

This is in no way close to ready yet; using it for conversation only at this moment.