OpenTelemetry exporter plugin, and built-in plugin provision

[vigoo]

Resolves #1613
Resolves #1614

Introduces a way to have built-in oplog processor plugins:

• they are stored in the plugins dir of this repo, compiled with golem-cli
• we store the compiled wasm in the repo too, so cargo install works for golem/golem-cli
• they are embedded in the registry service binary
• the built-in plugins are automatically deployed to the system account
• every new environment automatically gets grants to use them

Adds the first such built-in plugin, the OpenTelemetry exporter:

• supports traces, logs and metrics
• tested with dockerized otel-collector and jaeger

Follow-up: #3015

[vigoo]

One thing I forgot to check / implement: how do we provision changed / updated built-in plugins when deploying to prod (but keeping the live db)

[vigoo]

One thing I forgot to check / implement: how do we provision changed / updated built-in plugins when deploying to prod (but keeping the live db)

The single line change I've pushed that makes plugins versioned by the golem version fixes this, I think