feat: Add support for POSIX 1003.1e capabilities

[ralphm]

From the archlinux wiki:

Capabilities (POSIX 1003.1e, capabilities(7)) provide fine-grained control over superuser permissions, allowing use of the root user to be avoided.
[..]
Capabilities are implemented on Linux using extended attributes (xattr(7)) in the security namespace.

Currently, when using -@, you get:

/usr/libexec/netdata/plugins.d$ ls -al@ apps.plugin
.rwxr-x---@ 567k root  5 Nov 01:27  apps.plugin
                                   └── security.capability: "\u{1}\0\0\u{2}\u{4}\0\u{8}\0\u{4}\0\u{8}"

Decoding this using getcap yields:

/usr/libexec/netdata/plugins.d$ getcap apps.plugin
apps.plugin cap_dac_read_search,cap_sys_ptrace=eip

It would be nice if eza could decode the capabilities, and show this as follows (possibly by a new flag):

.rwxr-x---@ 567k root  5 Nov 01:27  apps.plugin
                                   └── security.capability: cap_dac_read_search,cap_sys_ptrace=eip