Add a DVS eye tracking dataset from the paper 3ET

[ZuowenWang0000]

The new tonic/datasets/threeET_eyetracking.py provides a new dataset from the paper 3ET: Efficient Event-based Eye Tracking using a Change-Based ConvLSTM Network (https://arxiv.org/pdf/2308.11771.pdf)

Thanks for maintaining this wonderful DVS dataset library.

[biphasic]

Hey Zuowen! This is great stuff! Please add your dataset in the docs so that others can see it https://github.com/neuromorphs/tonic/blob/develop/docs/datasets.rst
and create a test case https://github.com/neuromorphs/tonic/blob/develop/test/test_datasets.py
if you need a small test file uploaded somewhere for the test just post it here and I'll upload it.
Thanks a lot!

[ZuowenWang0000]

hello Gregor,
thanks for your info! I have added the entry to the documentation and I made a test case for the loader. Could you help unzip and upload these two files under a folder?
thanks again!

testcase.zip

[codecov-commenter]

Codecov Report

Attention: 8 lines in your changes are missing coverage. Please review.

Comparison is base (3ce48ad) 76.84% compared to head (83e82ae) 77.01%.
Report is 11 commits behind head on develop.

Files	Patch %	Lines
tonic/datasets/threeET_eyetracking.py	82.22%	8 Missing ⚠️

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Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #276      +/-   ##
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+ Coverage    76.84%   77.01%   +0.17%     
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  Files           53       54       +1     
  Lines         3001     3059      +58     
===========================================
+ Hits          2306     2356      +50     
- Misses         695      703       +8     

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[biphasic]

perfect, thanks a lot. Here are the links to the two uploaded files:
testcase.txt https://nextcloud.lenzgregor.com/s/G6ejNmXNnB2sKyc
testcase.h5 https://nextcloud.lenzgregor.com/s/4aiA4BAqz5km4Gc

[biphasic]

this looks great now! Nicely done. Are you happy for me to merge?

[ZuowenWang0000]

yes please merge. thanks!