Added error model using PhotErr.

[jfcrenshaw]

Change Description

This PR addresses this ticket, by moving the LSSTErrorModel from rail_base to this repo, and removing the explicit error model implementation by just wrapping the error model in PhotErr.

Once this PR is merged, we need to merge two other PRs:

• this PR removes the old error model from rail_base
• this PR updates the example notebooks in rail

[codecov[bot]]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.69% :tada:

Comparison is base (11ee329) 79.06% compared to head (a14ae2f) 79.75%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #10 +/- ## ========================================== + Coverage 79.06% 79.75% +0.69% ========================================== Files 5 6 +1 Lines 640 662 +22 ========================================== + Hits 506 528 +22 Misses 134 134 ``` | [Files Changed](https://app.codecov.io/gh/LSSTDESC/rail_astro_tools/pull/10?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=LSSTDESC) | Coverage Δ | | |---|---|---| | [src/rail/creation/degradation/lsst\_error\_model.py](https://app.codecov.io/gh/LSSTDESC/rail_astro_tools/pull/10?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=LSSTDESC#diff-c3JjL3JhaWwvY3JlYXRpb24vZGVncmFkYXRpb24vbHNzdF9lcnJvcl9tb2RlbC5weQ==) | `100.00% <100.00%> (ø)` | |

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