Add origin time sampling trie post process

[codecov[bot]]

Codecov Report

Attention: 3 lines in your changes are missing coverage. Please review.

Comparison is base (fe560ff) 97.73% compared to head (0d64c03) 97.37%.

Files	Patch %	Lines
...at/phylogenetic_inference/tree/_build_tree_trie.py	50.00%	3 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #136 +/- ## ========================================== - Coverage 97.73% 97.37% -0.36% ========================================== Files 622 627 +5 Lines 8556 8621 +65 ========================================== + Hits 8362 8395 +33 - Misses 194 226 +32 ``` | [Flag](https://app.codecov.io/gh/mmore500/hstrat/pull/136/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/136/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Matthew+Andres+Moreno) | `97.37% <96.29%> (-0.36%)` | :arrow_down: | 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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