feat: add schema file for radar_threshold_filter and upadted the README file

[vish0012]

…ME file

Description

• Implement the ROS Node configuration layout described in Autoware Foundation Discussion #3371 for the (autoware_cluster_merger)
• Remove duplication of parameter declaration between the source code and the parameter file.
• Remove the default value from the source code to ensure all parameter values are passed from the parameter files.
• Use types that match those returned from declare_parameter() to prevent confusion and potential coding errors.
• Move the default parameter file to a standardized location. Use the JSON Schema for that.
• Create the schema

Related links

Parent Issue:

• Link

How was this PR tested?

Successfully build using colcon build --symlink-install --cmake-args -DCMAKE_BUILD_TYPE=Release --packages-up-to autoware_radar_threshold_filter

Passed ros2 launch launch/radar_threshold_filter.launch.xml

Notes for reviewers

None.

Interface changes

None.

Effects on system behavior

None.

[github-actions]

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[YoshiRi]

LGTM
Please wait until the CI test passed.

[technolojin]

Please make the json-schema-check passed
https://github.com/autowarefoundation/autoware.universe/actions/runs/12860383472/job/35905376882?pr=9980#step:3:89