[ENH] boilerplate layer, streamlined extension contract

[fkiraly]

This PR streamlines the extension contract for adding more estimators. There are minimal breaking changes, imo these do not require deprecation due to changes affecting only buggy interfaces.

Changes:

• the extension locus for bootstraps is moved to _bootstrap and _get_n_bootstraps with a clearly documented extension template. These are called from bootstrap and get_n_bootstraps.
• Repetitive boilerplate code is moved to the space between public and private method.
• Input checking is moved to a single function, and added to get_n_bootstraps where it was missing.
• the unused (or buggy) groups argument is removed from get_n_bootstraps.

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 89.65517% with 3 lines in your changes are missing coverage. Please review.

Project coverage is 88.63%. Comparing base (5d53806) to head (74776b4). Report is 70 commits behind head on main.

Files	Patch %	Lines
src/tsbootstrap/base_bootstrap.py	88.88%	3 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #135 +/- ## ========================================== + Coverage 84.77% 88.63% +3.86% ========================================== Files 17 31 +14 Lines 2607 2851 +244 ========================================== + Hits 2210 2527 +317 + Misses 397 324 -73 ```

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[fkiraly]

Q from meeting today: is X and y necessary in get_n_bootstraps? That is, isn't this always identical to the param, n_bootstraps? Or, is this present for compatibility reasons?

[astrogilda]

Compatibility reasons

On Fri, Apr 12, 2024, 5:18 PM Franz Király @.***> wrote:

Q from meeting today: is X and y necessary in get_n_bootstraps? That is, isn't this always identical to the param, n_bootstraps? Or, is this present for compatibility reasons?

— Reply to this email directly, view it on GitHub https://github.com/astrogilda/tsbootstrap/pull/135#issuecomment-2052544869, or unsubscribe https://github.com/notifications/unsubscribe-auth/AFTOOHSQDN2PXPKXZRFS56DY5BFTRAVCNFSM6AAAAABGEJWXAWVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZDANJSGU2DIOBWHE . You are receiving this because you are subscribed to this thread.Message ID: @.***>

[fkiraly]

... with ... ?

[astrogilda]

... with ... ?

sorry forgot to respond. compatibility with crossvalidation in sklearn, which has a get_cv method iirc.