new `weights` argument for `gglikert()`, `gglikert_stacked()` and `g…

[larmarange]

…glikert_data()`

fix #29

[codecov[bot]]

Codecov Report

Patch coverage: 92.70% and project coverage change: -0.51 :warning:

Comparison is base (2130df9) 95.98% compared to head (ebecace) 95.48%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #30 +/- ## ========================================== - Coverage 95.98% 95.48% -0.51% ========================================== Files 11 12 +1 Lines 748 820 +72 ========================================== + Hits 718 783 +65 - Misses 30 37 +7 ``` | [Impacted Files](https://codecov.io/gh/larmarange/ggstats/pull/30?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Joseph+Larmarange) | Coverage Δ | | |---|---|---| | [R/weighted\_quantile.R](https://codecov.io/gh/larmarange/ggstats/pull/30?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Joseph+Larmarange#diff-Ui93ZWlnaHRlZF9xdWFudGlsZS5S) | `88.09% <88.09%> (ø)` | | | [R/gglikert.R](https://codecov.io/gh/larmarange/ggstats/pull/30?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Joseph+Larmarange#diff-Ui9nZ2xpa2VydC5S) | `95.47% <96.29%> (-0.25%)` | :arrow_down: |

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