Updates Types.fpp to use optimized sizes for enumerations

[kyleajones]

• Update enumerations in Types.fpp to use U8 instead of the default I32; the full I32 size is not needed for these simple enumerations

Related Issue(s)	n/a
Has Unit Tests (y/n)	n
Documentation Included (y/n)	n

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Change Description

This change request modifies the enumeration size for all enums listed in Types.fpp from the default I32 type to the smaller U8 type.

Rationale

This change will improve the memory footprint for telemetry channels that are defined by structs that contain members of types defined in this file. Particularly useful in memory-constrained systems that use F-Prime.

Testing/Review Recommendations

The change is straightforward. One review item worth considering would be using I8 instead of U8 as the type. In either case, all enums are well within the bounds of either type. I don't know if F-Prime has a preference to use the signed version of the type for these enums or if unsigned is fine.

Future Work

No planned future work associated with this issue.

[LeStarch]

@bocchino could you weigh in on the use of an unsigned type as the enumeration backing type? Is this ok to do?

[bocchino]

Yes, that seems fine.