This is an initial commit of a @bugsnag/js plugin for Azure Functions. It wraps the Azure Functions handler and catches unhandled exceptions. It also automatically adds the Azure Functions context to any errors reported to Bugsnag.

This plugin is based on the AWS Lambda plugin.

Basic unit tests are included.

If two function invocations overlap, it is possible the context sent on an error contains incorrect data. Imagine this sequence:

    1. Func 1 starts
    2. Func 2 starts
    3. Func 1 throws an error

In this scenario, since we're using a per-process client, the context reported with the error is a combination of function 1 and function 2 context.

To address this, we treat the scenario similar to the express plugin, and clone the client for each invocation so the metadata associated with it is correct.

This also adds a bugsnag property to the context, which the function can use to notify of errors (and have context included automatically).