Implement store as part of the hub

[axdotl]

This PR adds the store implementation which becomes part of the hub.

[codecov-commenter]

Codecov Report

Merging #316 (a05393c) into rework-kobs-architecture (371ca2f) will increase coverage by 0.31%.
The diff coverage is 47.69%.

@@                     Coverage Diff                      @@
##           rework-kobs-architecture     #316      +/-   ##
============================================================
+ Coverage                     44.38%   44.70%   +0.31%     
============================================================
  Files                            45       46       +1     
  Lines                          2431     2691     +260     
============================================================
+ Hits                           1079     1203     +124     
- Misses                         1333     1426      +93     
- Partials                         19       62      +43     

Impacted Files	Coverage Δ
pkg/hub/store/store.go	47.69% <47.69%> (ø)

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 371ca2f...a05393c. Read the comment docs.