[minor] Changelog + codecov

[blefaudeux]

What does this PR do?

Follow up from #189, I forgot to update the changelog, and updating codecov so that /experimental is not counted (there are tests, but need triton v2 and build from source for now

Before submitting

• Did you have fun?
  • Make sure you had fun coding 🙃
• Did you read the contributor guideline?
• Was this discussed/approved via a Github issue? (no need for typos, doc improvements)
  • N/A
• Did you make sure to update the docs?
  • N/A
• Did you write any new necessary tests?
  • N/A
• Did you update the changelog? (if needed)
  • N/A

PR review

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[codecov-commenter]

Codecov Report

Merging #191 (cbf3a67) into main (02e5abc) will increase coverage by 12.48%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##             main     #191       +/-   ##
===========================================
+ Coverage   79.49%   91.97%   +12.48%     
===========================================
  Files          64       57        -7     
  Lines        3389     2929      -460     
===========================================
  Hits         2694     2694               
+ Misses        695      235      -460     

Flag	Coverage Δ
Python	91.97% <ø> (+12.48%)	⬆️

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

Impacted Files	Coverage Δ
experimental/ragged_inference/seq_kv_cache.py
...al/ragged_inference/triton_v2_ragged_qk_dotprod.py
...mental/ragged_inference/garbage_pad_ragged_acts.py
experimental/ragged_inference/test_utils.py
experimental/setup.py
experimental/ragged_inference/triton_v2_matmul.py
...erimental/ragged_inference/triton_v2_qk_dotprod.py

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