'Return_id_scaling_2NN' now works when the class is initalized with only distance matrices

[codecov-commenter]

Codecov Report

Patch coverage: 87.71% and project coverage change: +0.45 :tada:

Comparison is base (c93d472) 81.40% compared to head (6afcfed) 81.85%.

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #92 +/- ## ========================================== + Coverage 81.40% 81.85% +0.45% ========================================== Files 10 10 Lines 1506 1538 +32 ========================================== + Hits 1226 1259 +33 + Misses 280 279 -1 ``` | [Impacted Files](https://app.codecov.io/gh/sissa-data-science/DADApy/pull/92?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None) | Coverage Δ | | |---|---|---| | [dadapy/id\_estimation.py](https://app.codecov.io/gh/sissa-data-science/DADApy/pull/92?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None#diff-ZGFkYXB5L2lkX2VzdGltYXRpb24ucHk=) | `84.92% <87.27%> (+0.86%)` | :arrow_up: | | [dadapy/\_utils/utils.py](https://app.codecov.io/gh/sissa-data-science/DADApy/pull/92?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%> (ø)` | | | [dadapy/data.py](https://app.codecov.io/gh/sissa-data-science/DADApy/pull/92?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None#diff-ZGFkYXB5L2RhdGEucHk=) | `98.07% <100.00%> (ø)` | | ... and [3 files with indirect coverage changes](https://app.codecov.io/gh/sissa-data-science/DADApy/pull/92/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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[AldoGl]

Thanks @diegodoimo, great enhancement, and I also like the 'single_scale' vs 'multiscale' division and naming.

If you have done all you wanted to do I think we could rebase and merge. Let me know!

[diegodoimo]

Great we can rebase