IIIT-5K dataset integration

[felixdittrich92]

This PR integrates the IIIT-5K dataset recognition part

TODO:
upload dataset:
TRAIN
TEST

@fg-mindee
Can you add both and send me SHA and URL ?

Issues:
#587

[fg-mindee]

Hi there 👋

Considering IIIT-5K is available publicly, let's use the public URL rather than reuploading it :)

[fg-mindee]

Thanks Felix! I added a few comments, let me know what you think 👌

[codecov]

Codecov Report

Merging #589 (081dc08) into main (a792a82) will increase coverage by 0.12%.
The diff coverage is 97.05%.

@@            Coverage Diff             @@
##             main     #589      +/-   ##
==========================================
+ Coverage   96.03%   96.15%   +0.12%     
==========================================
  Files         110      111       +1     
  Lines        4265     4296      +31     
==========================================
+ Hits         4096     4131      +35     
+ Misses        169      165       -4     

Flag	Coverage Δ
unittests	96.15% <97.05%> (+0.12%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
doctr/datasets/iiit5k.py	96.77% <96.77%> (ø)
doctr/datasets/__init__.py	100.00% <100.00%> (ø)
doctr/datasets/datasets/base.py	95.45% <100.00%> (-0.11%)	⬇️
doctr/utils/data.py	98.11% <0.00%> (+9.43%)	⬆️

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[fg-mindee]

Thanks for the edits! I suggest reverting the changes about the target_task and this will apply to all datasets and is not related to this PR goal directly :)

[fg-mindee]

Some last suggestions and we're good :)

[fg-mindee]

Looks good, thanks a lot @felixdittrich92 🙏