New strategy pathplanner event markers

[msonnier]

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• [ ] Code is complete, and naming of variables, methods and classes are readable by non-coder humans.
• [ ] This code change has been tested and validated working as expected.
• [ ] This code change has been reflected in robot documentation in the docs folder.
• [ ] The questions below have all been answered.
• [ ] The title of this PR has been updated to describe the change made, for example, [Subsystem or Command Name] Short description of change.
• [ ] Assignees (usually yourself) have been assigned in the "Assignees" section to the right.
• [ ] Relevant reviewers have been assigned under the "Reviewers" section at the right.

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