Dev is numeric

[zdelrosario]

Develop is_numeric selection helper

[codecov[bot]]

Codecov Report

Base: 77.35% // Head: 77.36% // Increases project coverage by +0.01% :tada:

Coverage data is based on head (01c05a3) compared to base (504e295). Patch coverage: 100.00% of modified lines in pull request are covered.

:exclamation: Current head 01c05a3 differs from pull request most recent head 0be7fd9. Consider uploading reports for the commit 0be7fd9 to get more accurate results

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #212 +/- ## ========================================== + Coverage 77.35% 77.36% +0.01% ========================================== Files 87 87 Lines 6698 6702 +4 ========================================== + Hits 5181 5185 +4 Misses 1517 1517 ``` | [Impacted Files](https://codecov.io/gh/zdelrosario/py_grama/pull/212?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Zachary+del+Rosario) | Coverage Δ | | |---|---|---| | [grama/dfply/select.py](https://codecov.io/gh/zdelrosario/py_grama/pull/212/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Zachary+del+Rosario#diff-Z3JhbWEvZGZwbHkvc2VsZWN0LnB5) | `93.33% <100.00%> (+0.22%)` | :arrow_up: | Help us with your feedback. Take ten seconds to tell us [how you rate us](https://about.codecov.io/nps?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Zachary+del+Rosario). Have a feature suggestion? [Share it here.](https://app.codecov.io/gh/feedback/?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Zachary+del+Rosario)

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