[UNO Q] Add support for grayscale animation

[lucarin91]

Now we only support animation with full britness, based on an old api for the UNO R4, it could be useful to also support api for grayscale animation instead.

For reference, here is the summary of the current api:

• loadSequence(const uint32_t frames[][5]), which loads a list of frames compacted in 4 int32 plus one int32 for the frame timeout.
• playSequence(bool loop = false), just run the loaded sequence with or without a loop

If we want to go with a compacted frame representation, we could use 10 int32 for each frame, plus one for the frame timeout. (i.e., (1383)/32 = 9.75 ~= 10).

A possible proposal is to add a new implementation of the loadSequence with support also grayscale

• loadSequence(const uint32_t frames[][11])