DeckGLMap takes the full viewport

The component does not honor its parent size.
E.g. in the python example if the height is reduced:
```python
wcc.Frame(
style={"flex": 10, "height": "40vh"},
children=[map_obj],
),
```
The resulting render is truncated:

This seems to be a well known issue with DeckGL and is solvable by setting the nearest parent position to `relative`.
https://stackoverflow.com/questions/60881824/how-to-prevent-deck-gl-layers-from-occupying-entire-viewport

Locate the DeckGLMap component and reproduce the sizing problem using the Python example with a reduced parent height. Inspect how the map is positioned relative to its parent and verify that the rendered map honors the parent dimensions without truncation.

Written by the indexing model from the issue text.