Move examples to contrib

[pellared]

~~A follow-up after https://github.com/open-telemetry/opentelemetry-go/pull/5791 in contrib is required and afterwards here we need to fix the example/dice.~~

• [x] Copy all example(s) to contrib
  • We should not version the copied examples. They can just be git hash referenced.
  • https://github.com/open-telemetry/opentelemetry-go-contrib/pull/6158
  • https://github.com/open-telemetry/opentelemetry-go-contrib/pull/6160
• [x] Revert example/dice changes from https://github.com/open-telemetry/opentelemetry-go/pull/5791 so that it uses otelslog.
  • https://github.com/open-telemetry/opentelemetry-go-contrib/pull/6162
• [x] Deprecate the examples in core repo
  • https://github.com/open-telemetry/opentelemetry-go/pull/5854
• [ ] RELEASE
• [ ] Remove the examples from core repo
• [ ] Update examples otel.io to target contrib repo (instead of core)

[MrAlias]

This round-about dependency seems like something we should address. Should this example be moved to contrib? Should all examples?

[pellared]

This round-about dependency seems like something we should address. Should this example be moved to contrib?

It makes sense also because this example also uses go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp

Should all examples?

It may be indeed easier to keep all examples in contrib.

[dashpole]

I'm OK with moving examples to contrib