[Task] add auth for namespaces

[John-Lin]

No description provided.

[codecov-io]

Codecov Report

Merging #287 into develop will increase coverage by 0.6%.
The diff coverage is 70%.

@@            Coverage Diff             @@
##           develop     #287     +/-   ##
==========================================
+ Coverage    78.56%   79.16%   +0.6%     
==========================================
  Files           60       60             
  Lines         3401     3475     +74     
==========================================
+ Hits          2672     2751     +79     
+ Misses         553      552      -1     
+ Partials       176      172      -4

Impacted Files	Coverage Δ
src/server/route.go	84.92% <100%> (+0.12%)	⬆️
src/server/handler_namespace.go	68.37% <66.66%> (-0.15%)	⬇️
src/prometheuscontroller/controller.go	88.9% <0%> (+2.75%)	⬆️

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