Parse error for numeric constant with leading zero

[jtbandes]

A user reported this in the Webviz Slack workspace.

Certain msg definitions (example kobuki_msgs/VersionInfo) have numeric constant with some leading zeros: uint64 SMOOTH_MOVE_START = 0000000000000001

ROS seems to handle this fine, but rosbag.js throws an error when trying to parse the constant, because JSON.parse throws. (@foxglove/rosmsg does handle it correctly, although I don't think we were aware of this bug/limitation when we wrote it.)