Add Go sample app

[damemi]

Fixes #30

[damemi]

Version v0.2.1-alpha of the go instrumentation (the latest release) crashes in this for the client app:

{"level":"error","ts":1687975483.9678535,"caller":"cli/main.go:76","msg":"error while analyzing target process","error":"could not find function offsets for instrumenter","stacktrace":"main.main\n\t/usr/local/google/home/mikedame/go/src/github.com/open-telemetry/opentelemetry-go-instrumentation/cli/main.go:76\nruntime.main\n\t/usr/lib/google-golang/src/runtime/proc.go:267"}

The next release of https://github.com/open-telemetry/opentelemetry-go-instrumentation should fix that, tested locally and I think the added support for net/http client is what's missing

[damemi]

Should work once open-telemetry/opentelemetry-operator#1915 is released in the operator

[damemi]

Merging this. it still may not work until the new upstream operator release is published but that should be any day