Fix #382, Align CF Command Counter implementation to cFS standard

[thnkslprpt]

Checklist

• I reviewed the Contributing Guide.
• I signed and emailed the appropriate Contributor License Agreement to [email protected] and copied [email protected].

Describe the contribution

• Fixes CF command counters format inconsistent with cFS #382
  • Command counters renamed
    • cmd renamed to CommandCounter
    • err renamed to CommandErrorCounter
  • Command counters changed from size 16 to size 8, and moved out of their own struct into the HK packet directly (this is how all other cFS components/apps implemented the counters)
  • hk renamed to HkPacket (most cFS components/apps use this common name for the housekeeping packet)

Note: if the CamelCase is an issue, can still implement these changes as snake_case, although I guess now is as good a time as any to start converting CF variables to CamelCase. If so I can open a new issue to flag that all variables should be changed over - all at once (if someone wants to implement that) or gradually as changes are made.
CF is the only cFS app/component to use snake_case for naming variables.

Testing performed
GitHub CI actions all passing successfully (incl. Build + Run, Unit Tests etc.).

Expected behavior changes
Command/CommandError counters now held directly in the HK packet, instead of through an additional struct member.

This PR improves consistency across cFS, and makes future maintenance easier as variables are named and located as expected.

Contributor Info
Avi Weiss @thnkslprpt