docs: use of opentracing spans and jaeger with bee

[mfw78]

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Description

Just to mention another tool for the job https://opentelemetry.io/.

Since we are using the OpenTracing library that is an archived project we might switch to OpenTelemetry as they also suggest on their main OpenTracing webpage.

Originally posted by @martinconic in #5005

From my understanding, there is support within bee to collect tracing spans and that this was used in early development in conjunction with Jaeger for assisting with diagnosing / debugging node interactions. This is one of the main reasons why there are "headers" within the libp2p setup within bee. Having this capability - but no demonstration / documentation on how to use it - represents tangible limitations on new client developers (and perhaps some present client developers).