Add error handler to replace global otel error handler

[RebeccaMahany]

The default global otel error handler prints all logs to stderr, which a) messes up our log formatting and b) is not desirable since it doesn't account for log level. This PR adds a small error handler to ensure that otel errors are logged with our usual logger, at the appropriate level.

From:

2023/06/21 13:29:16 traces export: context deadline exceeded: rpc error: code = Unavailable desc = connection error: desc = "transport: Error while dialing: dial tcp 127.0.0.1:4317: connect: connection refused"

To:

{"caller":"error_handler.go:22","component":"trace_exporter","err":"traces export: context deadline exceeded: rpc error: code = Unavailable desc = connection error: desc = \"transport: Error while dialing: dial tcp 127.0.0.1:4317: connect: connection refused\"","msg":"tracing error","session_pid":67708,"severity":"debug","ts":"2023-06-23T15:15:44.558797Z"}