Add input_format argument to segmentation metrics

[SkafteNicki]

What does this PR do?

Fixes #2563
I was foolish to think that the two formats supported in the new segmentation metrics could be differentiated on just based on the value of the tensors. My mistake. To fix this we need a explicit argument, but this opens up for supporting other input formats.

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• Did you write any new necessary tests?

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📚 Documentation preview 📚: https://torchmetrics--2572.org.readthedocs.build/en/2572/

[codecov]

Codecov Report

Attention: Patch coverage is 64.70588% with 6 lines in your changes missing coverage. Please review.

Project coverage is 34%. Comparing base (8ca1735) to head (c13055b).
Report is 98 commits behind head on master.

❗ There is a different number of reports uploaded between BASE (8ca1735) and HEAD (c13055b). Click for more details.

HEAD has 76 uploads less than BASE

Flag	BASE (8ca1735)	HEAD (c13055b)
torch1.12.1+cpu	2	1
Linux	24	12
python3.9	16	8
cpu	39	20
Windows	6	3
python3.8	6	3
torch1.13.1+cpu	6	3
torch1.10.2+cpu	2	1
macOS	9	5
python3.10	9	5
torch2.0.1	3	2
torch1.11.0+cpu	2	1
torch2.3.0	2	1
python3.11	8	4
torch2.3.0+cpu	6	3
torch2.0.1+cpu	6	3
torch1.13.1	2	1
torch2.2.2+cpu	4	2
torch2.1.2+cpu	2	1
torch2.2.2	2	1

Additional details and impacted files

@@           Coverage Diff            @@
##           master   #2572     +/-   ##
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- Coverage      69%     34%    -35%     
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  Files         314     314             
  Lines       17663   17669      +6     
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- Hits        12181    5937   -6244     
- Misses       5482   11732   +6250     

[Borda]

ok, I missed it for 1.4.2 but I believe can have 1.5.0 shortly