Use extensions in Julia 1.9+

[richardreeve]

• [x] Switch to extensions for Julia 1.9+
• [x] Use SpatialEcology Assemblages for EcoBase testing
• [x] Add extension for AxisArrays with type names
• [x] Increase testing

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (d705ff5) 86.49% compared to head (450d606) 98.43%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## dev #50 +/- ## =========================================== + Coverage 86.49% 98.43% +11.93% =========================================== Files 15 16 +1 Lines 696 701 +5 =========================================== + Hits 602 690 +88 + Misses 94 11 -83 ```

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