Channels for visualization

[dev3225]

User story

1. As a user
2. I need empty zero signals to be replaced with signals that have certain amplitude and frequency.
3. So that it is better to visualize and understand the line thickness issue/bug.

Acceptance criteria

• Signals without noise are included.
• One channel sends random data within -1:1

Definition of done (DoD)

• Feature/Bug/Change has been implemented

• Application compiles successfully

• Code is documented

• Feature/Bug/Change is tested by at least one unit or e2e test

• Tests have been passed without warnings (except "deprecated" warnings)

• Changes have been reviewed

• PR has been merged to dev branch

• New dependencies have been added to bill of materials

• Software architecture diagram has been updated

• All acceptance criteria are fulfilled

• Screenshot is attached to issue

DoD general criteria

• Feature has been fully implemented
• Feature has been merged into the mainline
• All acceptance criteria were met
• Product owner approved features
• All tests are passing
• Developers agreed to release