feat(autoware.repos): add trt_batched_nms repository

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Description

This PR adds trt_batch_nms package to autoware.repos. This plugin is used by the RTMDet model.

Place the trt_batched_nms repository in the universe/external folder.

Related links

• Implement RTMDet to Perception Pipeline autoware.universe#7235

Tests performed

Not applicable.

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