Problem:
Creating a new workspace from the workspaces transient state, requires that one
first looks for the next available workspace number, and then presses that
number key.
Solution:
Add the keys: `c` and `C` to create a new workspace. Lowercase exits the state
and uppercase keeps it open.
Notes:
This matches the behaviour of 0..9, which exits the state, and C-0..C-9, which
keeps it open.
This is the last key/command, from the C-c C-w eyebrowse key bindings, that was
missing from the workspaces transient state.
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