feat: combine sorting methods

[SuniRein]

Which issue does this PR resolve?

Resolves #3064

What's changed?

You can combine different sorting methods in yazi.toml, like

sort-by = ["extension", "natural"]

A single string is interpreted as a single-element array. For example,

sort-by = "extension"

is treated the same as

sort-by = ["extension"]

for compatibility.

If two files are equivalent in all specified methods, it'll fallback to alphabetical, which is the same as before.

And you can also set sorting methods by keymaps by specifying multiple methods:

prepend_keymaps = [
  { on = [ ",", "e" ], run = [ "sort extension natural" ], desc = "Sort by extension in natural order" }
]

Further discussion

Currently sort-reverse is applied to all sorting methods globally, rather than allowing certain sorting methods to be reversed individually as some other file managers do.

However, the current configuration format could not extend this feature gracefully. Moreover, I personally do not have a strong need for it. So I did not implement it in this PR.

[sxyazi]

Currently sort-reverse is applied to all sorting methods globally, rather than allowing certain sorting methods to be reversed individually as some other file managers do.

This is actually a pretty good question, thank you for bringing it up! Let me give it some more thought on the future extension concern