[Enhancement]: Improve fluvio topic describe with additional information

[ajhunyady]

The current fluvio topic describe has been built 3 years ago and it's stale.

We should update this command with the following information:

$ fluvio topic describe my-topic
Name         : my-topic
Replication  : 1
Partitions   : 2 

PARTITION    LAST-OFFSET    LAST-PRODUCED   CONSUMERS
0            3,543          1 sec ago       c1, c2
1            1,240          5 sec ago       c3

Note

• Get offset and timestamp (for last produced) from fluvio partition list
• Get consumers from fluvio consumer list

[diogopontual]

Hey @ajhunyady... With some delay, I started fixing this issue. I have two questions:

1. I am assuming that LAST-OFFSET refers to status.leader.leo; Is that right?
2. IDK which field to use to calculate LAST-PRODUCED.

TY

[ajhunyady]

@diogopontual very cool!
@sehz can you please help with identify the right field?

[sehz]

Confirm.
To get last offset, use LEO (Last End Offset).
To get last produced, get last event and get timestamp of the event. This could be done in the client (easier) or can be calculated in the SC (that's more restructuring) and add to PartitionStatus but that's bigger efforts. So let's start with client approach

[ajhunyady]

@diogopontual this PR will send you all over the code base. Once you are done, you'll have a pretty good grip on how fluvio works 😉

[diogopontual]

Sounds good! That sounds good! I hope to understand everything and create this PR quickly!

TY