feature: add global name

[qiujiayu]

APISIX need add global name for log platform, zipkin, such as spring boot 'spring.application.name',

[qiujiayu]

#1370

the service name of Zipkin cloud be like this service_name = zipkin.service_name or core.name will be better.

[qiujiayu]

#1241

the skywalking plugin also need.

[spacewander]

This issue is marked as stale because it has not had activity for a long time. It will be closed in the next 7 days unless the label "stale" is removed. Thank you for your contributions.