feat(autoware_cluster_merger): Created Schema file and updated ReadME file for parameters settings

[vish0012]

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?

Package built locally.
colcon build --symlink-install --cmake-args -DCMAKE_BUILD_TYPE=Release --packages-up-to autoware_cluster_merger

Notes for reviewers

None.

Interface changes

None.

Effects on system behavior

None.

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