[3-5SP, 5SP] UI: Implement charts that can show DataSets

[ivan-cukic]

The chunked data needs to be displayable as:

• a continuous stream
• a correlation plot

Tthe primary tasks is to:

• find a good decoupling strategy between flow-graph Blocks<T> and corresponding ImGUi UI element (e.g. DataSource & DataSink <-> UI CHart element)
  • creating a GR block should create and link to the corresponding UI element and vice verse
  • starting point w.r.t. implementation should be DataSink
  • N.B. having a clean separation here allows other developers to expand/write new UI elements more easily based on this implementation
• DataSource should also be GR Block<T> (see also here), and not derived entirely in the UI
• DataSink & DataSource pararameters such as acquisition length/history or polling need to be modifiable on-the-fly.

Related: #5