Add centers_for_point service

[codecov[bot]]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.25 :tada:

Comparison is base (492e01c) 79.91% compared to head (1cc43b9) 80.17%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #132 +/- ## ========================================== + Coverage 79.91% 80.17% +0.25% ========================================== Files 61 63 +2 Lines 1967 1992 +25 ========================================== + Hits 1572 1597 +25 Misses 395 395 ``` | [Impacted Files](https://app.codecov.io/gh/akrherz/iem-web-services/pull/132?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=daryl+herzmann) | Coverage Δ | | |---|---|---| | [src/iemws/services/nws/current\_flood\_warnings.py](https://app.codecov.io/gh/akrherz/iem-web-services/pull/132?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=daryl+herzmann#diff-c3JjL2llbXdzL3NlcnZpY2VzL253cy9jdXJyZW50X2Zsb29kX3dhcm5pbmdzLnB5) | `90.00% <ø> (ø)` | | | [src/iemws/main.py](https://app.codecov.io/gh/akrherz/iem-web-services/pull/132?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=daryl+herzmann#diff-c3JjL2llbXdzL21haW4ucHk=) | `100.00% <100.00%> (ø)` | | | [src/iemws/models/nws/centers\_for\_point.py](https://app.codecov.io/gh/akrherz/iem-web-services/pull/132?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=daryl+herzmann#diff-c3JjL2llbXdzL21vZGVscy9ud3MvY2VudGVyc19mb3JfcG9pbnQucHk=) | `100.00% <100.00%> (ø)` | | | [src/iemws/services/nws/centers\_for\_point.py](https://app.codecov.io/gh/akrherz/iem-web-services/pull/132?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=daryl+herzmann#diff-c3JjL2llbXdzL3NlcnZpY2VzL253cy9jZW50ZXJzX2Zvcl9wb2ludC5weQ==) | `100.00% <100.00%> (ø)` | |

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