Add an `array_index` parameter to `block.get(property_name)` to get a
specific item from an array.
Example:
```python
verts = self.bf.block_from_addr[verts_ptr]
assert verts.get(b"co") == [-1.0, -1.0, -1.0] # index 0
assert verts.get(b"co", array_index=1) == [-1.0, -1.0, 1.0]
```
Reviewed-on: https://projects.blender.org/blender/blender-asset-tracer/pulls/92898
c69612b264