Implement pooled accumulating ducts

[codecov[bot]]

Codecov Report

Merging #91 into master will increase coverage by 9.58%. The diff coverage is 72.52%.

@@            Coverage Diff             @@
##           master      #91      +/-   ##
==========================================
+ Coverage   50.17%   59.75%   +9.58%     
==========================================
  Files         255      280      +25     
  Lines        8767     9679     +912     
==========================================
+ Hits         4399     5784    +1385     
+ Misses       4368     3895     -473     

Impacted Files	Coverage Δ
include/uit/ducts/mock/EmpAssertDuct.hpp	11.11% <ø> (ø)
include/uit/ducts/mock/NopDuct.hpp	11.11% <ø> (ø)
include/uit/ducts/mock/ThrowDuct.hpp	9.09% <ø> (ø)
.../uit/ducts/proc/impl/backend/AggregatedBackEnd.hpp	99.01% <ø> (ø)
...nclude/uit/ducts/proc/impl/backend/MockBackEnd.hpp	100.00% <ø> (ø)
...lude/uit/ducts/proc/impl/backend/PooledBackEnd.hpp	58.76% <ø> (ø)
...nclude/uit/ducts/proc/impl/backend/RdmaBackEnd.hpp	66.66% <ø> (ø)
...uit/ducts/proc/impl/backend/RuntimeSizeBackEnd.hpp	100.00% <ø> (ø)
...s/proc/impl/backend/impl/InletMemoryAggregator.hpp	98.21% <ø> (ø)
...t/ducts/proc/impl/backend/impl/InletMemoryPool.hpp	9.09% <ø> (ø)
... and 206 more

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[mmore500]

Closes #65 and #96