feat: add OTEL tracing span middleware during function proxy #1685
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Description
Add tracing package the standardizes an OpenTelemetry tracing initialization and Middleware that can be applied to the Gateway handlers.
Add the tracing middleware to the function proxy handler only.
Requires new env variables to be enabled, it is otherwise a no-op.
Motivation and Context
design/approved
labelResolves #1684
How Has This Been Tested?
Manually tested by using the tracing walkthrough https://github.com/LucasRoesler/openfaas-tracing-walkthrough but modifying the Gateway image to a locally built image from this branch
Types of changes
Checklist:
git commit -s