Build Distributed.jl like API over UCX

[vchuravy]

[codecov-io]

Codecov Report

Merging #33 (1ac14a8) into master (d622f9b) will increase coverage by 6.08%. The diff coverage is 79.60%.

@@            Coverage Diff             @@
##           master      #33      +/-   ##
==========================================
+ Coverage   64.54%   70.63%   +6.08%     
==========================================
  Files           7        8       +1     
  Lines         739      991     +252     
==========================================
+ Hits          477      700     +223     
- Misses        262      291      +29     

Impacted Files	Coverage Δ
src/UCX.jl	85.16% <ø> (+3.82%)	:arrow_up:
src/legacy.jl	79.60% <79.60%> (ø)
src/api/libucp_api.jl	14.43% <0.00%> (+1.21%)	:arrow_up:

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