Only consider obstacles on same layer as trace in autorouting

[seveibar]

[homie-gg[bot]]

This might have already been done via: Segments approach for trace rendering, support multi-layer traces.

[homie-gg[bot]]

This might have already been done via: add layers to obstacles.

[homie-gg[bot]]

Here are some pull requests that might be helpful reference for this task:

• Trace Hint Implementation (single layer)
• PCB Trace Support in Dataset Autorouting
• Autorouter same-net detection improvements, example1 fully routing

[homie-gg[bot]]

This might have already been done via: fix multilayer routing for traces with trace hints.