split up faer-entity from rest of the api

[codecov[bot]]

Codecov Report

All modified lines are covered by tests :white_check_mark:

Comparison is base (8a45835) 91.57% compared to head (ee0abfc) 92.05%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #80 +/- ## ========================================== + Coverage 91.57% 92.05% +0.48% ========================================== Files 57 57 Lines 63060 62709 -351 ========================================== - Hits 57746 57729 -17 + Misses 5314 4980 -334 ``` | [Files](https://app.codecov.io/gh/sarah-ek/faer-rs/pull/80?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=sarah) | Coverage Δ | | |---|---|---| | [faer-libs/faer-cholesky/src/bunch\_kaufman/mod.rs](https://app.codecov.io/gh/sarah-ek/faer-rs/pull/80?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=sarah#diff-ZmFlci1saWJzL2ZhZXItY2hvbGVza3kvc3JjL2J1bmNoX2thdWZtYW4vbW9kLnJz) | `97.42% <ø> (ø)` | | | [...er-libs/faer-cholesky/src/ldlt\_diagonal/compute.rs](https://app.codecov.io/gh/sarah-ek/faer-rs/pull/80?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=sarah#diff-ZmFlci1saWJzL2ZhZXItY2hvbGVza3kvc3JjL2xkbHRfZGlhZ29uYWwvY29tcHV0ZS5ycw==) | `93.22% <ø> (ø)` | | | [faer-libs/faer-cholesky/src/ldlt\_diagonal/mod.rs](https://app.codecov.io/gh/sarah-ek/faer-rs/pull/80?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=sarah#diff-ZmFlci1saWJzL2ZhZXItY2hvbGVza3kvc3JjL2xkbHRfZGlhZ29uYWwvbW9kLnJz) | `100.00% <ø> (ø)` | | | [faer-libs/faer-cholesky/src/ldlt\_diagonal/solve.rs](https://app.codecov.io/gh/sarah-ek/faer-rs/pull/80?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=sarah#diff-ZmFlci1saWJzL2ZhZXItY2hvbGVza3kvc3JjL2xkbHRfZGlhZ29uYWwvc29sdmUucnM=) | `29.31% <ø> (ø)` | | | [...aer-libs/faer-cholesky/src/ldlt\_diagonal/update.rs](https://app.codecov.io/gh/sarah-ek/faer-rs/pull/80?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=sarah#diff-ZmFlci1saWJzL2ZhZXItY2hvbGVza3kvc3JjL2xkbHRfZGlhZ29uYWwvdXBkYXRlLnJz) | `90.14% <ø> (ø)` | | | [faer-libs/faer-cholesky/src/lib.rs](https://app.codecov.io/gh/sarah-ek/faer-rs/pull/80?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=sarah#diff-ZmFlci1saWJzL2ZhZXItY2hvbGVza3kvc3JjL2xpYi5ycw==) | `0.00% <ø> (ø)` | | | [faer-libs/faer-cholesky/src/llt/compute.rs](https://app.codecov.io/gh/sarah-ek/faer-rs/pull/80?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=sarah#diff-ZmFlci1saWJzL2ZhZXItY2hvbGVza3kvc3JjL2xsdC9jb21wdXRlLnJz) | `93.65% <ø> (ø)` | | | [faer-libs/faer-cholesky/src/llt/inverse.rs](https://app.codecov.io/gh/sarah-ek/faer-rs/pull/80?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=sarah#diff-ZmFlci1saWJzL2ZhZXItY2hvbGVza3kvc3JjL2xsdC9pbnZlcnNlLnJz) | `75.40% <ø> (ø)` | | | [faer-libs/faer-cholesky/src/llt/mod.rs](https://app.codecov.io/gh/sarah-ek/faer-rs/pull/80?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=sarah#diff-ZmFlci1saWJzL2ZhZXItY2hvbGVza3kvc3JjL2xsdC9tb2QucnM=) | `99.67% <ø> (ø)` | | | [faer-libs/faer-cholesky/src/llt/reconstruct.rs](https://app.codecov.io/gh/sarah-ek/faer-rs/pull/80?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=sarah#diff-ZmFlci1saWJzL2ZhZXItY2hvbGVza3kvc3JjL2xsdC9yZWNvbnN0cnVjdC5ycw==) | `59.52% <ø> (ø)` | | | ... and [46 more](https://app.codecov.io/gh/sarah-ek/faer-rs/pull/80?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=sarah) | | ... and [1 file with indirect coverage changes](https://app.codecov.io/gh/sarah-ek/faer-rs/pull/80/indirect-changes?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=sarah)

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