feat(planning_simulator): log level arg

Description

This a draft PR which add a new argument "log_level" in planning_simulator. its linked to https://github.com/autowarefoundation/autoware.universe/pull/7661 aiming to initiate a discussion to explore if there are better solutions for adjusting the logging level.

Tests performed

Not applicable.

Effects on system behavior

Not applicable.

Interface changes

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autowarefoundation / autoware_launch