An implementation of the OpenTelemetry SDK for Perl

Changes for 0.018 - 2023-11-21T21:42:57+00:00

• Ensure shutdown and force_flush calls on the TracerProvider wait for the resuts of propagating those calls down to the processors
• Bump minimum version of OpenTelemetry to 0.010 for the implementation of the API
• Fix an issue with reporting dropped spans due to improper scalar conversion
• Fix an issue in the documentation of the OTEL_TRACES_EXPORTER variable and add some additional details