Compiler-added implicit padding in `FM_MonitorReportEntry_t` & `FM_ChildQueueEntry_t`

[thnkslprpt]

Checklist

• [x] I reviewed the Contributing Guide.
• [x] I performed a cursory search to see if the bug report is relevant, not redundant, nor in conflict with other tickets.

Describe the bug It seems that there is implicit padding being added by the compiler in FM_MonitorReportEntry_t & FM_ChildQueueEntry_t.

Code snips https://github.com/nasa/FM/blob/e7afedcfdf9ba50eac8a9bdda6ce70a4d1ef709d/fsw/inc/fm_msg.h#L512-L518 https://github.com/nasa/FM/blob/e7afedcfdf9ba50eac8a9bdda6ce70a4d1ef709d/fsw/inc/fm_msg.h#L656-L669

Expected behavior Make implicit padding explicit.

Reporter Info Avi Weiss @thnkslprpt