Missing environment variables

[ocelotl]

What are you trying to achieve?

I am trying to add these environment variables to the specification:

OTEL_EXPORTER_JAEGER_CERTIFICATE
OTEL_EXPORTER_JAEGER_INSECURE
OTEL_EXPORTER_ZIPKIN_TRANSPORT_FORMAT
OTEL_EXPORTER_OTLP_INSECURE
OTEL_EXPORTER_OTLP_METRIC_INSECURE
OTEL_EXPORTER_OTLP_SPAN_INSECURE

What did you expect to see?

Additional context.

OpenTelemetry Pyhton uses the before mentioned environment variables. They are not defined in this specification, I am suggesting we add them here because I expect other implementations to use them also.