fix(euclidean_cluster): add intensity field

[badai-nguyen]

Description

• To process and output the fields of clusters' pointcloud as the input topic including intensity field for voxel_grid_based_euclidean_cluster to solve the issue https://github.com/autowarefoundation/autoware.universe/issues/6785

Related links

• TIER IV INTERNAL LINK

Tests performed

• Confirmed by logging_simulator that voxel_grid_based_euclidean_cluster
  • Can process and output the topic with intensity field:

• Processing time increase a little bit for a quite complicated scene

Before	After

Notes for reviewers

Interface changes

Effects on system behavior

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[badai-nguyen]

@YoshiRi could I ask your review for this PR also?

[badai-nguyen]

@yukkysaito Do you have any comment for this PR? Otherwise, could you approve this PR as codeowner?