observability-kit 0.3.0

Configuration and other common entities related to observability
Documentation 
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Tools Kit for observable services.

## How to use it

### Configure tracing

1. Simple scenario with environment based configuration and plain output, ideal for Rust tests:

```rust
    let _result = observability_kit::tracing::init();
```

2. Open Telemetry Protocol configured tracing.

```rust
    let _result = observability_kit::otlp_tracing::try_init(env!("CARGO_PKG_NAME"));
```

You can use `podman compose up -d` to run [Jaeger](https://www.jaegertracing.io/), `RUST_LOG=trace cargo test`, wait a moment and see OTLP in action at [http://localhost:16686/search](http://localhost:16686/search)