text: temp drop Chrf implementation

[Borda]

What does this PR do?

let's remove the Chrf implementation until the licensing is clearly addressed/resolved
closes #2665

Before submitting

• Was this discussed/agreed via a Github issue? (no need for typos and docs improvements)
• Did you read the contributor guideline, Pull Request section?
• Did you make sure to update the docs?
• Did you write any new necessary tests?

PR review

Anyone in the community is free to review the PR once the tests have passed.
If we didn't discuss your PR in Github issues there's a high chance it will not be merged.

Did you have fun?

Make sure you had fun coding 🙃

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📚 Documentation preview 📚: https://torchmetrics--2668.org.readthedocs.build/en/2668/

[codecov]

Codecov Report

Attention: Patch coverage is 71.42857% with 2 lines in your changes missing coverage. Please review.

Project coverage is 39%. Comparing base (8d84cf4) to head (3960f55).
Report is 108 commits behind head on master.

❗ There is a different number of reports uploaded between BASE (8d84cf4) and HEAD (3960f55). Click for more details.

HEAD has 16 uploads less than BASE

Flag	BASE (8d84cf4)	HEAD (3960f55)
python3.8	3	2
cpu	22	18
torch1.13.1+cpu	3	1
Linux	13	9
python3.9	8	6
torch1.10.2+cpu	1	0
torch2.0.1+cpu	3	2
python3.10	5	4

Additional details and impacted files

@@           Coverage Diff            @@
##           master   #2668     +/-   ##
========================================
- Coverage      69%     39%    -30%     
========================================
  Files         316     316             
  Lines       17881   17729    -152     
========================================
- Hits        12331    6891   -5440     
- Misses       5550   10838   +5288