Fix XGBoostCVRegressor + Dependencies with Poetry v1.2

[amirhessam88]

Description

• Fixed package dependencies in pyproject.toml with poetry v1.2; The only issue is glmnet that depends on numpy.distutils to actually comple the BTS fortran code and this module is deprecated for numpy version >= 1.23; Therefore, for now we keep the numpy version < 1.23 until there is a new wheel file available for glmnet; issue already submitted.
• Refactored XGBoostCVRegressor + added unit-tests.
• More cleanup.

Resolves: #issue-number-here

Pull Request Checklist

• Added tests for added or changed code.
• Added documentation for changed code.

[codecov]

Codecov Report

Merging #137 (bfa8e59) into master (7864f7c) will increase coverage by 2.62%.
The diff coverage is 98.24%.

❗ Current head bfa8e59 differs from pull request most recent head 4edb46c. Consider uploading reports for the commit 4edb46c to get more accurate results

@@            Coverage Diff             @@
##           master     #137      +/-   ##
==========================================
+ Coverage   44.16%   46.79%   +2.62%     
==========================================
  Files          20       21       +1     
  Lines        2024     2030       +6     
  Branches      388      379       -9     
==========================================
+ Hits          894      950      +56     
+ Misses       1101     1051      -50     
  Partials       29       29              

Flag	Coverage Δ
unittests	46.79% <98.24%> (+2.62%)	⬆️

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

Impacted Files	Coverage Δ
src/slickml/classification/_xgboostcv.py	100.00% <ø> (ø)
src/slickml/regression/_todo.py	0.00% <0.00%> (ø)
src/slickml/regression/_xgboost.py	100.00% <ø> (ø)
src/slickml/regression/_xgboostcv.py	100.00% <100.00%> (ø)

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