feat: otlp

[prestwich]

cc @rswanson adds the following:
env configuration

const OTEL_ENDPOINT: &str = "OTEL_ENDPOINT";
const OTEL_PROTOCOL: &str = "OTEL_PROTOCOL";
const OTEL_LEVEL: &str = "OTEL_LEVEL";
const OTEL_TIMEOUT: &str = "OTEL_TIMEOUT";
const OTEL_ENVIRONMENT: &str = "OTEL_ENVIRONMENT_NAME";

endpoint: a URL. if configured, starts the exporter. omit for off.
protocol: legal values are grpc, json, binary. defaults to json
level: legal values are off, error, warn, info, debug, trace. defaults to trace
timeout: milliseconds as u64. defaults to 1000
environment: a string. optional. any value. name like "prod" or "dev" recommended. defaults to "unknown"

appears from groundcover docs that the following should be used

endpoint = {inCloud_Site}
protocol = grpc

[dylanlott]

Approved 🍶

[dylanlott]

👩‍🍳

[Evalir]

dank.

[prestwich]

closing as #55 is better