Support filtering exported services or other resources

[cezar-guimaraes]

Is your feature request related to a problem?

Currently, exporting services from virtual to host can only be toggled on/off. The docs understandably warn against disabling exporting services.

Which solution do you suggest?

Sync configuration should allow using metav1.LabelSelector, in particular MatchExpressions to allow negative expressions (i.e label/export-service NotIn ["false"]

Which alternative solutions exist?

None that I can think of.

Additional context

endpointslice with unexported parent service should probably not be exported as well. This could be checked by the syncer when exporting endpoints or config validation could force the endpoint configuration to match service. (is there a use case where one should be exported but not the other?)