Add max_depth parameter to ModelSummary

[ManuelPalermo]

What does this PR do?

Adds feature discussed in #8047 (comment)

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[pep8speaks]

Hello @ManuelPalermo! Thanks for updating this PR.

There are currently no PEP 8 issues detected in this Pull Request. Cheers! 🍻

Comment last updated at 2021-07-01 00:27:05 UTC

[codecov]

Codecov Report

Merging #8062 (a479cfa) into master (1afc1ca) will decrease coverage by 5%.
The diff coverage is 94%.

@@           Coverage Diff           @@
##           master   #8062    +/-   ##
=======================================
- Coverage      93%     88%    -5%     
=======================================
  Files         212     212            
  Lines       13581   13595    +14     
=======================================
- Hits        12624   11954   -670     
- Misses        957    1641   +684     

[awaelchli]

this doesn't work yet.

Trainer(weights_summary="full"|"top") does not display anything on this branch.

need to investigate.