Consider redirecting console.log to context.log

So used to using console.log, it can be difficult to pick up when we incorrectly use console instead of context. We could possible provide a stubbed console "pseudo global" that redirects calls to context.log.

Start by tracing how console.log and context.log are exposed in the Azure Functions host/runtime. Determine whether a pseudo-global console can safely redirect calls without changing existing behavior, and define tests that verify the redirected logging; done means console logging reaches context.log reliably.

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