Split out extras into fileformats-extras

[codecov[bot]]

Codecov Report

Patch coverage: 75.42% and project coverage change: -0.11 :warning:

Comparison is base (32ed5ff) 84.60% compared to head (5d90ad0) 84.50%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #21 +/- ## ========================================== - Coverage 84.60% 84.50% -0.11% ========================================== Files 28 28 Lines 1702 1768 +66 Branches 386 394 +8 ========================================== + Hits 1440 1494 +54 - Misses 197 211 +14 + Partials 65 63 -2 ``` | [Impacted Files](https://app.codecov.io/gh/ArcanaFramework/fileformats/pull/21?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=ArcanaFramework) | Coverage Δ | | |---|---|---| | [fileformats/core/mark.py](https://app.codecov.io/gh/ArcanaFramework/fileformats/pull/21?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=ArcanaFramework#diff-ZmlsZWZvcm1hdHMvY29yZS9tYXJrLnB5) | `70.14% <46.15%> (-16.52%)` | :arrow_down: | | [fileformats/core/utils.py](https://app.codecov.io/gh/ArcanaFramework/fileformats/pull/21?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=ArcanaFramework#diff-ZmlsZWZvcm1hdHMvY29yZS91dGlscy5weQ==) | `72.88% <65.21%> (-1.86%)` | :arrow_down: | | [fileformats/image/raster.py](https://app.codecov.io/gh/ArcanaFramework/fileformats/pull/21?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=ArcanaFramework#diff-ZmlsZWZvcm1hdHMvaW1hZ2UvcmFzdGVyLnB5) | `92.00% <77.77%> (+12.40%)` | :arrow_up: | | [fileformats/core/fileset.py](https://app.codecov.io/gh/ArcanaFramework/fileformats/pull/21?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=ArcanaFramework#diff-ZmlsZWZvcm1hdHMvY29yZS9maWxlc2V0LnB5) | `88.47% <89.79%> (+0.57%)` | :arrow_up: | | [fileformats/core/datatype.py](https://app.codecov.io/gh/ArcanaFramework/fileformats/pull/21?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=ArcanaFramework#diff-ZmlsZWZvcm1hdHMvY29yZS9kYXRhdHlwZS5weQ==) | `75.43% <100.00%> (+0.43%)` | :arrow_up: | | [fileformats/core/exceptions.py](https://app.codecov.io/gh/ArcanaFramework/fileformats/pull/21?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=ArcanaFramework#diff-ZmlsZWZvcm1hdHMvY29yZS9leGNlcHRpb25zLnB5) | `100.00% <100.00%> (ø)` | | | [fileformats/generic/\_\_init\_\_.py](https://app.codecov.io/gh/ArcanaFramework/fileformats/pull/21?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=ArcanaFramework#diff-ZmlsZWZvcm1hdHMvZ2VuZXJpYy9fX2luaXRfXy5weQ==) | `76.15% <100.00%> (+2.91%)` | :arrow_up: | ... and [1 file with indirect coverage changes](https://app.codecov.io/gh/ArcanaFramework/fileformats/pull/21/indirect-changes?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=ArcanaFramework)

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