Create or integrate channel statistics tool

[engelgabriel]

See https://moovel.github.io/teamchatviz/

[Xqua]

Anyone working on this ?

[engelgabriel]

The info should come from #726

[engelgabriel]

See also #5947

[AmauryVanEspen]

Could be interesting to cooperate onto metamaps/metamaps#1062

[mld18]

I like the teamchatviz approach. However, at least in the European Union the people statistics could be a privacy issue.

Maybe there's a leaner solution to start with. I'm interested to find orphan channels. So I'd like to have a tool (maybe in the administration section) that allows for something like channel timelines.

[engelgabriel]

Another example https://combot.org/

[engelgabriel]

Ref: #10726