Table type should be defined once in table header file

**Is your feature request related to a problem? Please describe.**
SampleTable_t is defined in both sample_app_msg.h and sample_table.c

**Describe the solution you'd like**
Define sample_table.h, and include where needed.

**Describe alternatives you've considered**
None

**Additional context**
None

**Requester Info**
Jacob Hageman - NASA/GSFC