Remove "kinesis" wording and switch back to "iota"

[wulfraem]

Description of change

During development, the placeholder name "kinesis" was used for IOTA rebased in this project. This PR removes this placeholder name and lets the "iota" based naming take over the role of the "kinesis" based naming.

This is most evident in the feature names, e.g.:

• feature kinesis-client -> iota-client
• feature kinesis -> iota

Therefore, the "iota" based names should be responsible for the same things in the rebased code base as they were in the stardust implementation.

Type of change

Add an x to the boxes that are relevant to your changes.

• Bug fix (a non-breaking change which fixes an issue)
• Enhancement (a non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation Fix

How the change has been tested

Tested against local tests.

Change checklist

Add an x to the boxes that are relevant to your changes.

• I have followed the contribution guidelines for this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes