Deprecate DataStore

[aoberoi]

Summary

This is related to #423 and #330.

Requirements (place an x in each [ ])

• I've read and understood the Contributing Guidelines and have done my best effort to follow them.
• I've read and agree to the Code of Conduct.

[codecov]

Codecov Report

Merging #437 into master will increase coverage by 0.01%.
The diff coverage is 100%.

@@            Coverage Diff            @@
##           master    #437      +/-   ##
=========================================
+ Coverage   89.09%   89.1%   +0.01%     
=========================================
  Files          44      44              
  Lines        1256    1258       +2     
  Branches      190     190              
=========================================
+ Hits         1119    1121       +2     
  Misses        137     137

Impacted Files	Coverage Δ
lib/clients/web/client.js	100% <ø> (ø)	⬆️
lib/data-store/memory-data-store.js	80.35% <ø> (ø)	⬆️
lib/clients/rtm/client.js	84.21% <ø> (ø)	⬆️
lib/data-store/data-store.js	93.39% <100%> (+0.06%)	⬆️
lib/clients/client.js	90.16% <100%> (+0.16%)	⬆️

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