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Simple/no dependency opentelemetry metrics exporter as json for metrics crate

Howto

use otlp_metrics_exporter::install_recorder;
use metrics::{counter, gauge, histogram};
use otlp_metrics_exporter::transport::{TransportConfig, send_metrics, send_metrics_with_interval};

let recorder = install_recorder(env!("CARGO_PKG_NAME"), env!("CARGO_PKG_VERSION"), "instance_name");

counter!("test_counter", "label1" => "label_value1").increment(1);
gauge!("test_gauge", "label2" => "label_value2").set(10);
histogram!("test_histogram", "buckets" => "10,30").record(10);

let config = TransportConfig {
   remote_addr: "127.0.0.1:9090".to_string(),
   endpoint: "/api/v1/otlp/v1/metrics".to_string(),
   headers: vec![("Authorization".to_string(), "Basic ame".to_string())],
   timeout: Duration::from_secs(5),
};

// send metrics manually
let response = send_metrics(&config, recorder.to_json(Duration::from_secs(600).into()).as_bytes())?;

// send metrics every 15 seconds for 15 second period
send_metrics_with_interval(config, Duration::from_secs(15), recorder);