NHS for triangles or edges

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 4.22535% with 136 lines in your changes are missing coverage. Please review.

Project coverage is 44.23%. Comparing base (940941a) to head (f86aea7).

Files	Patch %	Lines
src/nhs_face.jl	0.00%	133 Missing :warning:
src/grid_nhs.jl	66.66%	3 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #17 +/- ## =========================================== - Coverage 74.86% 44.23% -30.64% =========================================== Files 7 8 +1 Lines 191 321 +130 =========================================== - Hits 143 142 -1 - Misses 48 179 +131 ``` | [Flag](https://app.codecov.io/gh/trixi-framework/PointNeighbors.jl/pull/17/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=trixi-framework) | Coverage Δ | | |---|---|---| | [unit](https://app.codecov.io/gh/trixi-framework/PointNeighbors.jl/pull/17/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=trixi-framework) | `44.23% <4.22%> (-30.64%)` | :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=trixi-framework#carryforward-flags-in-the-pull-request-comment) to find out more.

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