Add support for configuring `OtlpHttpExporter` using environment variables defined by specs: https://github.com/open-telemetry/opentelemetry-specification/blob/v1.0.0/specification/protocol/exporter.md
Add support for configuring
OtlpHttpExporterusing environment variables defined by specs:https://github.com/open-telemetry/opentelemetry-specification/blob/v1.0.0/specification/protocol/exporter.md