Add tree distance estimation functionality

[codecov[bot]]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (6d4040c) 97.70% compared to head (5f84469) 97.71%.

Files	Patch %	Lines
...iliary_lib/_alifestd_categorize_triplet_asexual.py	97.22%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #133 +/- ## ======================================= Coverage 97.70% 97.71% ======================================= Files 615 618 +3 Lines 8402 8473 +71 ======================================= + Hits 8209 8279 +70 - Misses 193 194 +1 ``` | [Flag](https://app.codecov.io/gh/mmore500/hstrat/pull/133/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Matthew+Andres+Moreno) | Coverage Δ | | |---|---|---| | [tests](https://app.codecov.io/gh/mmore500/hstrat/pull/133/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Matthew+Andres+Moreno) | `97.71% <98.61%> (+<0.01%)` | :arrow_up: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Matthew+Andres+Moreno#carryforward-flags-in-the-pull-request-comment) to find out more.

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