add custom annotations per facet

[codecov[bot]]

Codecov Report

All modified lines are covered by tests :white_check_mark:

Comparison is base (8f148c1) 97.11% compared to head (26caffd) 97.33%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## dev #134 +/- ## ========================================== + Coverage 97.11% 97.33% +0.22% ========================================== Files 29 29 Lines 1939 1949 +10 ========================================== + Hits 1883 1897 +14 + Misses 56 52 -4 ``` | [Files](https://app.codecov.io/gh/trevismd/statannotations/pull/134?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Florian+Charlier) | Coverage Δ | | |---|---|---| | [statannotations/Annotator.py](https://app.codecov.io/gh/trevismd/statannotations/pull/134?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Florian+Charlier#diff-c3RhdGFubm90YXRpb25zL0Fubm90YXRvci5weQ==) | `92.72% <100.00%> (+0.99%)` | :arrow_up: | | [tests/test\_integrate\_annotator.py](https://app.codecov.io/gh/trevismd/statannotations/pull/134?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Florian+Charlier#diff-dGVzdHMvdGVzdF9pbnRlZ3JhdGVfYW5ub3RhdG9yLnB5) | `100.00% <100.00%> (ø)` | |

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