[WIP-do not merge] feature: async support

[phanak-sap]

[codecov-commenter]

Codecov Report

Merging #225 (f72fd36) into master (e18fc73) will decrease coverage by 0.56%. The diff coverage is 79.03%.

@@            Coverage Diff             @@
##           master     #225      +/-   ##
==========================================
- Coverage   92.90%   92.34%   -0.57%     
==========================================
  Files           6        6              
  Lines        2792     2847      +55     
==========================================
+ Hits         2594     2629      +35     
- Misses        198      218      +20     

Impacted Files	Coverage Δ
pyodata/v2/service.py	89.58% <55.17%> (-1.79%)	:arrow_down:
pyodata/client.py	100.00% <100.00%> (ø)

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