feat(otel): Enable opentelemetry for the Spin shim

[Mossaka]

This enables the opentelemetry feature from the containerd-shim-wasm which provides otel for the shim process. Before containerd-shim-wasm v0.9.0, the container process would inherit the otel runtime from the shim process, and thus causing a conflict with the spin telemetry runtime. Now, the container process was initialized (a.k.a zygote process) at the very begining when the shim process is in a clean state, and so it is free to initialize it's own otel runtime.

This PR builds on top of #271

FYI @calebschoepp

Example

[kate-goldenring]

@Mossaka what is the flow for configuring an OTEL ingester in your example? I am assuming that otel config needs to be passed somewhere else besides the container spec

[Mossaka]

@Mossaka what is the flow for configuring an OTEL ingester in your example?

It's passed down by containerd. https://github.com/containerd/runwasi/blob/main/docs/opentelemetry.md