Kernel status indicator

[DenisaCG]

Include the kernel status indicator next to the kernel name that is being used for the workspace, as it is done in notebooks.

Important to note that this feature might need some adapting as the busy status indicator for notebooks also mentions the number of cells that are running, in our case maybe this could be translated to the blocks that are running or removed altogether.

This is the relevant code section that defines the KernelStatus class in which the KernelStatusComponent is rendered.

Additionally, the kernel status indicator can also be added to the status bar.