Batching of the same log events

[DixonDs]

Now, when we use periodic batching sink (#2), it should be quite straightforward to group the same log events into a single Teams message and instead add additional properties to the Teams message like Count and, maybe, something like FirstOccurredDate/OccurredLastDate.

[SeppPenner]

What's the status here? This would be a great feature...

[SeppPenner]

You can check out https://github.com/SeppPenner/Serilog.Sinks.MicrosoftTeams. I have fixed both issues that are currently in this repo and added a new sink.