docs: add LAUNCH_ARGUMENTS.md for autoware_launch

[xmfcx]

Description

This PR branch was created with https://blog.google/technology/google-labs/jules/

I just wanted to test this new coding agent. But I think it did a good job with this one.

This commit introduces a new LAUNCH_ARGUMENTS.md file in the autoware_launch directory.

This file documents the primary launch arguments available in the main autoware.launch.xml. It categorizes arguments and provides descriptions, expected values, and default values to help you configure and run Autoware more effectively.

The documented categories include:

• Essential Parameters
• Module Presets
• Module Launch Toggles
• Global Configuration
• Vehicle Specific Configuration
• Map Specific Configuration
• System Specific Configuration
• Tools and Visualization
• Perception Specific Configuration
• Auto Mode Configuration

How was this PR tested?

Notes for reviewers

None.

Effects on system behavior

None.

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[xmfcx]

[xmfcx]

I still prefer using these agents locally but this was just a test.