feature request: resolution enums to have an INVALID or COUNT enumerator

[diablodale]

I request a tweak to the enums for camera resolutions -- to have an entry that represents something invalid or not-a-resolution and/or a count of the enumerators.

I would use this in my code to distinguish a native camera resolution and a non-native camera resolution during resolution lookups/mapping. If named such, I could also use it to count the number of enumerators in the resolution enum.

Example

struct MonoCameraProperties { ...
enum class SensorResolution : int32_t { THE_720_P, THE_800_P, THE_400_P, THE_480_P, THE_INVALID };
// or
enum class SensorResolution : int32_t { THE_720_P, THE_800_P, THE_400_P, THE_480_P, THE_COUNT };

struct ColorCameraProperties { ...
enum class SensorResolution : int32_t { THE_1080_P, THE_4_K, THE_12_MP, THE_13_MP, THE_INVALID };
// or
enum class SensorResolution : int32_t { THE_1080_P, THE_4_K, THE_12_MP, THE_13_MP, THE_COUNT };

Currently I hack in an "invalid" value by static_cast<dai::MonoCameraProperties::SensorResolution>(-1)