feat: add architecture diagram

[GALLLASMILAN]

See the result on this page: https://github.com/i-am-bee/bee-observe/tree/add-diagram?tab=readme-ov-file

[pilartomas]

Points below are only suggestions, the diagram is good enough to get the picture as is 👍

• Given this is a production diagram, I'd expand the node-sdk part. It should be clear that there is an application running the OpenTelemetry Node SDK and the framework.
• I would also omit the word "filter" in the collector as there is nothing to filter that's in the diagram's dataflow.
• I would use word trace rather than span although spans are technically correct.

[GALLLASMILAN]

• node-sdk = The node-sdk could be part of the framework and the spans can be exported directly.
• filter = There is a default filter on agents spans => This filter will be exposed in the collector in our stack. It's very important to implement it becouse of the performance.
• I let the spans keyword, the trace is computed in the Observe part, but It should not be important for the architecture diagram.