feat(api-server): add inspect meshgatewayroute dataplanes endpoint

[michaelbeaumont]

Summary

Part of #4103

Changelog: feat(inspect): add gateways to policy inspect

[codecov-commenter]

Codecov Report

Merging #4104 (c02d026) into master (d19c95d) will decrease coverage by 0.01%.
The diff coverage is 70.21%.

@@            Coverage Diff             @@
##           master    #4104      +/-   ##
==========================================
- Coverage   55.92%   55.91%   -0.02%     
==========================================
  Files         930      930              
  Lines       55825    55872      +47     
==========================================
+ Hits        31219    31239      +20     
- Misses      22144    22172      +28     
+ Partials     2462     2461       -1     

Impacted Files	Coverage Δ
pkg/api-server/inspect_endpoints.go	75.29% <70.21%> (-0.63%)	⬇️
pkg/insights/components.go	70.00% <0.00%> (-30.00%)	⬇️
pkg/core/resources/store/customizable_store.go	55.55% <0.00%> (-22.23%)	⬇️
pkg/xds/cache/once/cache.go	87.17% <0.00%> (-7.70%)	⬇️
pkg/core/runtime/component/component.go	81.13% <0.00%> (-7.55%)	⬇️
pkg/events/eventbus.go	85.18% <0.00%> (-7.41%)	⬇️
pkg/core/resources/manager/cache.go	83.11% <0.00%> (-2.60%)	⬇️
pkg/insights/resyncer.go	71.60% <0.00%> (-2.47%)	⬇️
pkg/core/resources/model/rest/resource.go	72.83% <0.00%> (+1.23%)	⬆️
pkg/plugins/runtime/gateway/generator.go	85.78% <0.00%> (+3.55%)	⬆️
... and 3 more

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