Refactor autoscaling parameters

Since we have collected all concurrency related options with the option prefix `--concurrency-` and also list them together in `kn service describe`, the autoscale window parameter should be also in this group. So either move everything to `--concurrency-` or, move everything (limit, target, utilization, window) to `--autoscale`.

I'm not sure in which direction to go, moving to `--concurrency` is easier as most of the options are already `--concurrency` prefixed, on the other "concurrency" is quite tedious to type, so maybe 'autoscale-' is a better prefix? But we might even consider a total different prefix as well?

Start by locating the CLI definitions for the concurrency-related options and the code that lists them in `kn service describe`. Compare the existing `--concurrency-` and autoscale window handling, then resolve which consistent prefix should cover limit, target, utilization, and window. Done means the options use the chosen naming scheme and are listed consistently.

Written by the indexing model from the issue text.