feat(tier4_system_msgs): improve diagnostic graph efficiency

[isamu-takagi]

Related Links

#96, autowarefoundation/autoware.universe#3829

Description

Messages created in #96 were also sending static data every time. This PR improves communication efficiency by dividing the message into static and dynamic parts. See README for details.

Remarks

Remove the previous DiagnosticGraph message after reflecting the changes in the diagnostics_graph_aggregator package.

Pre-Review Checklist for the PR Author

PR Author should check the checkboxes below when creating the PR.

• Code is properly formatted
• Assign PR to reviewer

Checklist for the PR Reviewer

Reviewers should check the checkboxes below before approval.

• Commits are properly organized and messages are according to the guideline
• Code is properly formatted
• PR title describes the changes

Post-Review Checklist for the PR Author

PR Author should check the checkboxes below before merging.

• All open points are addressed and tracked via issues or tickets
• Write release notes

CI Checks

• Build and test for PR: Required to pass before the merge.
• Check spelling: NOT required to pass before the merge. It is up to the reviewer(s). See here if you want to add some words to the spell check dictionary.