feat: enhanced execution format

[sxyazi]

The new enhanced exec format will be shipped with Yazi v0.1.3, the old format will still be available until v0.1.5.

Mainly affects opener rules, you should be able to switch between them easily:

[opener]
archive = [
	{ cmd = "unar", args = [ "$0" ] },
]
text = [
	{ cmd = "nvim", args = [ "$*" ], block = true },
]
# ...

to

[opener]
archive = [
	{ exec = 'unar "$1"' },
]
text = [
	{ exec = 'nvim "$@"', block = true },
]
# ...

This makes more complex cases possible, such as:

[opener]
video = [
	{
		exec = '''mediainfo "$1"; echo "PRESS ENTER TO EXIT"; read''',
		block = true,
		display_name = "Show media info"
	},
]

Note: To keep the compatibility with shell, the first argument of the new format is $1 instead of $0, the second is $2, and so on. The old format will not be affected.