feat(store): replace go maps with gokv

[glimchb]

• feat(store): replace go maps with gokv
• feat(store): replace go maps with gokv in tests
• fix(store): add gomap to handle NQNs

[codecov]

Codecov Report

Merging #431 (01e2ef9) into main (4ae03d6) will decrease coverage by 6.89%.
The diff coverage is 48.50%.

@@            Coverage Diff             @@
##             main     #431      +/-   ##
==========================================
- Coverage   90.76%   83.88%   -6.89%     
==========================================
  Files           9        9              
  Lines         899      999     +100     
==========================================
+ Hits          816      838      +22     
- Misses         59      111      +52     
- Partials       24       50      +26     

Files	Coverage Δ
pkg/frontend/frontend.go	57.14% <100.00%> (-5.36%)	⬇️
pkg/frontend/nvme_subsystem.go	83.88% <50.00%> (-9.02%)	⬇️
pkg/frontend/nvme_controller.go	81.64% <47.27%> (-12.00%)	⬇️
pkg/frontend/nvme_namespace.go	81.60% <47.82%> (-11.52%)	⬇️