chore: group meta info for APISIX resources to Metadata structure

[tokers]

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[codecov-io]

Codecov Report

Merging #225 (03b6700) into master (fb53d65) will increase coverage by 0.81%.
The diff coverage is 45.09%.

@@            Coverage Diff             @@
##           master     #225      +/-   ##
==========================================
+ Coverage   44.57%   45.38%   +0.81%     
==========================================
  Files          33       33              
  Lines        2035     2047      +12     
==========================================
+ Hits          907      929      +22     
+ Misses        987      980       -7     
+ Partials      141      138       -3     

Impacted Files	Coverage Δ
pkg/ingress/apisix/route.go	0.00% <0.00%> (ø)
pkg/ingress/apisix/service.go	0.00% <0.00%> (ø)
pkg/apisix/resource.go	81.31% <100.00%> (+0.85%)	⬆️
pkg/ingress/apisix/upstream.go	74.00% <100.00%> (+1.08%)	⬆️
pkg/apisix/route.go	41.72% <0.00%> (+1.98%)	⬆️
pkg/apisix/cluster.go	35.07% <0.00%> (+6.16%)	⬆️

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