FluxChandrashekar_NormalDir

[DanielDoehring]

This implements flux_chandrashekar with normal_direction supplied.

[github-actions[bot]]

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Created with :heart: by the Trixi.jl community.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 96.08%. Comparing base (3ec681e) to head (960e7a0).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #1926 +/- ## ======================================= Coverage 96.08% 96.08% ======================================= Files 450 450 Lines 36169 36215 +46 ======================================= + Hits 34751 34797 +46 Misses 1418 1418 ``` | [Flag](https://app.codecov.io/gh/trixi-framework/Trixi.jl/pull/1926/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=trixi-framework) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/trixi-framework/Trixi.jl/pull/1926/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=trixi-framework) | `96.08% <100.00%> (+<0.01%)` | :arrow_up: | 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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