Function legacy_normalize_otlp_name 

pub fn legacy_normalize_otlp_name(name: &str) -> String

Normalize otlp instrumentation, metric and attribute names

https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/metrics/api.md#instrument-name-syntax

• since the name are case-insensitive, we transform them to lowercase for better sql usability
• replace . and - with _