Add optional comment field to Marker

[nickblt]

Link the Issue(s) this Pull Request is related to.

Fixes #744

Summarize your change.

This adds an optional comment field to the Marker object as requested in #744

Reference associated tests.

Added new tests that specifically test to make sure the comment is being added and serialized/deserialized successfully

[linux-foundation-easycla[bot]]

The committers listed above are authorized under a signed CLA.

• :white_check_mark: login: nickblt / name: Nicholas Bui LeTourneau (4eeed2f88a418c0ab374f5fc9e53a1fb645298e2, 09dd254fca5e53c311fc363cedf78f25e6af51ee, 74dd686275e9215f25670ff2c8ffc07d1352e1fb)

[codecov-commenter]

Codecov Report

Attention: 9 lines in your changes are missing coverage. Please review.

Comparison is base (d22935e) 79.84% compared to head (74dd686) 79.83%.

Additional details and impacted files

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