[Feature]: Represent in SDS Metadata file a single-sample block with variable size.

[ReinhardKeil]

Arm-Examples/ModelNova#32 introduces a different data format.

Data that we write to the SDS file (and process with SDS-View and SDS VS Code extension) are:
• 4 bytes (float): probability that detected object was PAPER
• 4 bytes (float): probability that detected object was ROCK
• 4 bytes (float): probability that detected object was SCISSORS
• 4 bytes (float): probability that detected object was UNKNOWN

Data they write if flag F was activated and that they need for processing with Fusion Studio are:
• 100 bytes (null terminated string): label name of predicted class name
• 2 bytes (uint16_t): predicted class index
• 2 bytes: padding
• 4 bytes (float): confidence score of the predicted class

In case of an active F flag, the SDS utilities cannot interpret the data.

Potential solutions imply that a dynamic block size is interpreted as a single-sample block.

Extend Metadata format with:

• (A) option to represent dynamic size information (i.e. dim-x: *). This could be only specified in the last value of a content: node.
• (B) indicate that a block contains only a single sample. The rest of the content of a block would be then ignored.