feat: Allow abbreviations for long option names

[j-xella]

eza is one of those commands that can be invoked often. As such, it is important to optimize it for minimal number of key strokes, IMO.

One way to do it is to allow for abbreviation long option names, as long as they are unambiguous. For example eza --abs should be equivalent to eza --absolute, as long as there are no other long options that start with "abs". Same with eza --ab, eza --abso etc...

Currently, "unknown argument" error is thrown.

This is especially important for those options that only have long names. I imagine there will be more such options in the future, so it will be getting more important with time.

[MartinFillon]

As we are moving the arg parsing to clap I think it is better to have a proposition. I personally don't like that idea to much as aliases exists, and it can also start to become confusing for all the options to add some options.