Added initial jaeger support

This MR adds support of jaeger to this chart.

Currently I faced next problems during testing on my instance:

• I wasn't able to make it work with udp_endpoint pointed to jaeger-agent
• I don't know why but http_endpoint worked only when I specified jaeger svc as jaeger-collect.jaeger, but it didn't work with jaeger-collect.jaeger.svc.cluster.local
• Spans in jaeger are not includes spans from other components - so I see separate unicorn and workspace spans for same call, but i don't see unicorn sub-span from workhorse span view
• On 12.7 I don't see any gitlab-shell spans
• I didn't found how to modify service names (it's usefull if I would like to have single instance of jaeger for my companies gitlab "prod" and "test")

Also problems connected with chart now:

• I haven't added docs
• I haven't added changelog entity
• As input i'm using fully rendered tracing URL, so url options should be already URL encoded
• I haven't tried enabling link to jaeger in perfomance bar

#1320 (closed)