Resolve "Use unsigned integer for Stream Data"

What does this MR do?

Changes data type of StreamData to unsigned integer with 32 bit.

Why was this MR needed?

Easier data handling.

What are the relevant issue numbers?

Closes #31 (closed)

Does this MR meet the acceptance criteria?

Conformity

• Changelog Entry
• Documentation created/updated or Follow-Up Review Issue created
• Conform by Style Guides / Coding Practices

Verification

• Unit Tests written / updated