added Kstar binomial estimator

[imacocco]

Proposed changes

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Types of changes

What types of changes does your code introduce? Put an x in the boxes that apply

• [ ] Bugfix (non-breaking change which fixes an issue)
• [ X ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist

Put an x in the boxes that apply.

• [ X ] Lint and unit tests pass locally with my changes
• [ X ] I have added tests that prove my fix is effective or that my feature works

[codecov-commenter]

Codecov Report

Patch coverage: 85.10% and project coverage change: +0.06 :tada:

Comparison is base (c93d472) 81.40% compared to head (366ea68) 81.46%.

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #93 +/- ## ========================================== + Coverage 81.40% 81.46% +0.06% ========================================== Files 10 10 Lines 1506 1565 +59 ========================================== + Hits 1226 1275 +49 - Misses 280 290 +10 ``` | [Impacted Files](https://app.codecov.io/gh/sissa-data-science/DADApy/pull/93?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None) | Coverage Δ | | |---|---|---| | [dadapy/base.py](https://app.codecov.io/gh/sissa-data-science/DADApy/pull/93?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None#diff-ZGFkYXB5L2Jhc2UucHk=) | `77.77% <ø> (ø)` | | | [dadapy/\_utils/utils.py](https://app.codecov.io/gh/sissa-data-science/DADApy/pull/93?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None#diff-ZGFkYXB5L191dGlscy91dGlscy5weQ==) | `66.08% <64.28%> (+1.75%)` | :arrow_up: | | [dadapy/data.py](https://app.codecov.io/gh/sissa-data-science/DADApy/pull/93?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None#diff-ZGFkYXB5L2RhdGEucHk=) | `96.47% <93.93%> (-1.61%)` | :arrow_down: | ... and [2 files with indirect coverage changes](https://app.codecov.io/gh/sissa-data-science/DADApy/pull/93/indirect-changes?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None)

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