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Expose line caps on AGG lines (#2734)

Lines drawn with AGG method have quite a bit of machinery in the
background that isn't exposed. Line caps are one of them, and this PR
exposes it as a property.

```py
import numpy as np
from vispy import scene

canvas = scene.SceneCanvas(show=True)
view = canvas.central_widget.add_view()
view.camera = 'panzoom'

line = scene.visuals.Line(
    np.array([[0, 0], [10, 10], [10, 0]]),
    width=10,
    color='white',
    method='agg',
    parent=view.scene,
)
view.camera.set_range()
```


<img width="802" height="602" alt="image"
src="https://github.com/user-attachments/assets/5628bf82-ddea-4b97-8ce2-8ddc6a847371"
/>


```py
line.line_caps = '>', '='
```

<img width="802" height="602" alt="image"
src="https://github.com/user-attachments/assets/9f118edf-220c-47bb-a0b9-bf6e98d85174"
/>


The extra artifacts present in both images are not caused by this PR,
but are some opther bug already present on main.

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