Azure Application Insights Legacy Python SDK

This is the *legacy* Python SDK for sending telemetry to Azure Application Insights. It allows applications to send custom events, metrics, and traces directly to Application Insights. For new applications, it is strongly recommended to use the OpenTelemetry-based `azure-monitor-opentelemetry-distro` package. The `applicationinsights` package is currently at version 0.11.10 and receives minimal updates, primarily maintenance.