Introduce sampler storage module

[ghost]

Changes

• Introduces a new abacus-sampler-storage module, which includes a dao concept for working with sampler spans.

[cf-gitbot]

We have created an issue in Pivotal Tracker to manage this:

https://www.pivotaltracker.com/story/show/160346531

The labels on this github issue will be updated when the story is started.

[cfdreddbot]

Hey momchil-sap!

Thanks for submitting this pull request! I'm here to inform the recipients of the pull request that you and the commit authors have already signed the CLA.

[codecov[bot]]

Codecov Report

Merging #1030 into master will increase coverage by 0.04%. The diff coverage is 97.14%.

@@            Coverage Diff             @@
##           master    #1030      +/-   ##
==========================================
+ Coverage   95.02%   95.07%   +0.04%     
==========================================
  Files         107      108       +1     
  Lines        3138     3208      +70     
==========================================
+ Hits         2982     3050      +68     
- Misses        156      158       +2

Impacted Files	Coverage Δ
lib/sampler/storage/src/lib/span-dao.js	97.14% <97.14%> (ø)

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