store: Parameterize store prefix

[gupadhyaya]

Fixes #56

[codecov-commenter]

Codecov Report

Merging #57 (84e3a7f) into main (7da1572) will decrease coverage by 0.16%. The diff coverage is 22.22%.

@@            Coverage Diff             @@
##             main      #57      +/-   ##
==========================================
- Coverage   66.11%   65.95%   -0.16%     
==========================================
  Files          35       35              
  Lines        2768     2776       +8     
==========================================
+ Hits         1830     1831       +1     
- Misses        787      793       +6     
- Partials      151      152       +1     

Impacted Files	Coverage Δ
store/keys.go	100.00% <ø> (ø)
store/options.go	51.21% <12.50%> (-9.39%)	:arrow_down:
store/store.go	63.19% <100.00%> (ø)