Add RR Lyrae test dataset

[codecov[bot]]

Codecov Report

Patch coverage: 84.05% and project coverage change: -0.71% :warning:

Comparison is base (038612a) 93.64% compared to head (8f39781) 92.93%. Report is 8 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #127 +/- ## ========================================== - Coverage 93.64% 92.93% -0.71% ========================================== Files 76 77 +1 Lines 6796 6939 +143 ========================================== + Hits 6364 6449 +85 - Misses 432 490 +58 ``` | [Files Changed](https://app.codecov.io/gh/light-curve/light-curve-feature/pull/127?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=light-curve) | Coverage Δ | | |---|---|---| | [src/time\_series.rs](https://app.codecov.io/gh/light-curve/light-curve-feature/pull/127?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=light-curve#diff-c3JjL3RpbWVfc2VyaWVzLnJz) | `93.46% <ø> (-0.99%)` | :arrow_down: | | [test-util/src/lc\_data/from\_issues.rs](https://app.codecov.io/gh/light-curve/light-curve-feature/pull/127?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=light-curve#diff-dGVzdC11dGlsL3NyYy9sY19kYXRhL2Zyb21faXNzdWVzLnJz) | `59.09% <50.94%> (-39.19%)` | :arrow_down: | | [test-util/src/lc\_data/record.rs](https://app.codecov.io/gh/light-curve/light-curve-feature/pull/127?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=light-curve#diff-dGVzdC11dGlsL3NyYy9sY19kYXRhL3JlY29yZC5ycw==) | `47.36% <80.00%> (-39.00%)` | :arrow_down: | | [test-util/src/lc\_data/types.rs](https://app.codecov.io/gh/light-curve/light-curve-feature/pull/127?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=light-curve#diff-dGVzdC11dGlsL3NyYy9sY19kYXRhL3R5cGVzLnJz) | `94.82% <94.73%> (-5.18%)` | :arrow_down: | | [src/features/bazin\_fit.rs](https://app.codecov.io/gh/light-curve/light-curve-feature/pull/127?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=light-curve#diff-c3JjL2ZlYXR1cmVzL2JhemluX2ZpdC5ycw==) | `98.33% <100.00%> (-0.01%)` | :arrow_down: | | [src/features/eta\_e.rs](https://app.codecov.io/gh/light-curve/light-curve-feature/pull/127?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=light-curve#diff-c3JjL2ZlYXR1cmVzL2V0YV9lLnJz) | `100.00% <100.00%> (ø)` | | | [src/features/linear\_trend.rs](https://app.codecov.io/gh/light-curve/light-curve-feature/pull/127?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=light-curve#diff-c3JjL2ZlYXR1cmVzL2xpbmVhcl90cmVuZC5ycw==) | `100.00% <100.00%> (ø)` | | | [src/features/otsu\_split.rs](https://app.codecov.io/gh/light-curve/light-curve-feature/pull/127?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=light-curve#diff-c3JjL2ZlYXR1cmVzL290c3Vfc3BsaXQucnM=) | `91.19% <100.00%> (ø)` | | | [src/features/villar\_fit.rs](https://app.codecov.io/gh/light-curve/light-curve-feature/pull/127?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=light-curve#diff-c3JjL2ZlYXR1cmVzL3ZpbGxhcl9maXQucnM=) | `98.58% <100.00%> (ø)` | | | [src/tests.rs](https://app.codecov.io/gh/light-curve/light-curve-feature/pull/127?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=light-curve#diff-c3JjL3Rlc3RzLnJz) | `88.85% <100.00%> (+0.27%)` | :arrow_up: | | ... and [3 more](https://app.codecov.io/gh/light-curve/light-curve-feature/pull/127?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=light-curve) | |

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.