[Fix] fix bbox_color in Det3DLocalVisualizer

[maciejmajek]

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Motivation

Examples like this are not working because of a bug.
Error trace:

TypeError: paint_uniform_color(): incompatible function arguments. The following argument types are supported:
    1. (self: open3d.cuda.pybind.geometry.LineSet, color: numpy.ndarray[numpy.float64[3, 1]]) -> open3d.cuda.pybind.geometry.LineSet

Invoked with: LineSet with 12 lines., 0.0

Modification

Add code that determines whether to use a single color for all bounding boxes or force the user to specify a color for each bbox.

BC-breaking (Optional)

Use cases (Optional)

Checklist

1. Pre-commit or other linting tools are used to fix the potential lint issues.
2. The modification is covered by complete unit tests. If not, please add more unit test to ensure the correctness.
3. If the modification has potential influence on downstream projects, this PR should be tested with downstream projects.
4. The documentation has been modified accordingly, like docstring or example tutorials.

[CLAassistant]

All committers have signed the CLA.

[OpenMMLab-Assistant-004]

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[codecov]

Codecov Report

Attention: 7 lines in your changes are missing coverage. Please review.

Files	Coverage Δ
mmdet3d/visualization/local_visualizer.py	25.65% <0.00%> (-0.29%)	⬇️

📢 Thoughts on this report? Let us know!.

[ZCMax]

Supporting assigning color for each box can be well applied to the need that assigning the color of each box according to its category.