Documenting TODOs

[SinfulPhantom]

There are several TODOs scattered around the code base such as:
https://github.com/microsoft/opentelemetry-exporters-python/blob/8aac369664eafa82e8ed77d7d69067ef8cebf9a3/azure_monitor/src/azure_monitor/trace.py#L125

Could there be a string detailing what needs to be done after the TODO or can issues be made so that these can be taken care of?

[lzchen]

Yes this is a good suggestion. @reyang can you help here?

[reyang]

@lzchen, most likely not due to other priorities.

[lzchen]

Fixed with [#23]