CADC-12678 - add checks for axis length.

[codecov[bot]]

Codecov Report

Patch coverage: 88.47% and project coverage change: -0.05% :warning:

Comparison is base (d6374b2) 93.19% compared to head (c76482e) 93.14%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #170 +/- ## ========================================== - Coverage 93.19% 93.14% -0.05% ========================================== Files 23 23 Lines 8547 8606 +59 ========================================== + Hits 7965 8016 +51 - Misses 582 590 +8 ``` | [Files Changed](https://app.codecov.io/gh/opencadc/caom2tools/pull/170?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=opencadc) | Coverage Δ | | |---|---|---| | [caom2utils/caom2utils/caom2blueprint.py](https://app.codecov.io/gh/opencadc/caom2tools/pull/170?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=opencadc#diff-Y2FvbTJ1dGlscy9jYW9tMnV0aWxzL2Nhb20yYmx1ZXByaW50LnB5) | `89.89% <88.47%> (-0.08%)` | :arrow_down: |

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