add kstar-gride id estimator and basic test

[AldoGl]

Proposed changes

A first implementation of the Gride estimator coupled with a kstar estimation of the optimal scale.

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: 98.57% and project coverage change: +0.82 :tada:

Comparison is base (84f6f2a) 80.58% compared to head (4fba0fc) 81.40%.

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #87 +/- ## ========================================== + Coverage 80.58% 81.40% +0.82% ========================================== Files 10 10 Lines 1447 1506 +59 ========================================== + Hits 1166 1226 +60 + Misses 281 280 -1 ``` | [Impacted Files](https://app.codecov.io/gh/sissa-data-science/DADApy/pull/87?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None) | Coverage Δ | | |---|---|---| | [dadapy/data.py](https://app.codecov.io/gh/sissa-data-science/DADApy/pull/87?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None#diff-ZGFkYXB5L2RhdGEucHk=) | `98.07% <97.50%> (-1.93%)` | :arrow_down: | | [dadapy/\_utils/utils.py](https://app.codecov.io/gh/sissa-data-science/DADApy/pull/87?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None#diff-ZGFkYXB5L191dGlscy91dGlscy5weQ==) | `64.33% <100.00%> (+3.76%)` | :arrow_up: | | [dadapy/id\_estimation.py](https://app.codecov.io/gh/sissa-data-science/DADApy/pull/87?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None#diff-ZGFkYXB5L2lkX2VzdGltYXRpb24ucHk=) | `84.05% <100.00%> (+1.15%)` | :arrow_up: |

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