Refactor compute_bootci to use scipy.stats.bootstrap

[raphaelvallat]

Closes #189

Summary

Replaces the internal bootstrap implementation in compute_bootci with scipy.stats.bootstrap, raises the minimum SciPy requirement to 1.10, and upgrades the default CI method to BCa.

Changes

compute_bootci

Before	After
Custom NumPy bootstrap loop	Delegates to scipy.stats.bootstrap
Default method: cper (bias-corrected percentile, legacy)	Default method: bca (bias-corrected and accelerated)
Supported: norm, per, cper	Supported: bca, per, basic, norm

• New default — bca: corrects for both bias and skewness via jackknife resampling; the
  gold-standard method recommended in the bootstrap literature.
• New method — basic: basic (pivotal) bootstrap.
• Removed — cper: legacy bias-corrected percentile method (no acceleration); superseded by
  bca.
• Vectorized built-in functions (mean, std, var) now use axis=-1 convention required by
  scipy.stats.bootstrap.

Minimum SciPy version

Bumped from 1.8.0 → 1.10.0 in pyproject.toml and CI matrix.
scipy.stats.bootstrap gained the BCa method in 1.9 and stabilized in 1.10.

Tests & docs

• Removed cper-specific test cases; added bca and basic to the combination test.
• Updated expected CI values to match the new scipy-backed implementation.
• Cleaned up docstring examples (removed redundant SciPy comparisons, updated output values).

Breaking changes

• method="cper" (and "cpercentile") is no longer valid — raises AssertionError.
• The default CI has changed from cper to bca; numerical outputs will differ for existing
  code that relied on the default.
• SciPy ≥ 1.10 is now required.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.36%. Comparing base (f08cc88) to head (74aa59f).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #505      +/-   ##
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- Coverage   98.36%   98.36%   -0.01%     
==========================================
  Files          19       19              
  Lines        3311     3305       -6     
  Branches      492      488       -4     
==========================================
- Hits         3257     3251       -6     
  Misses         32       32              
  Partials       22       22              

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