core: add options to delegate BPFFS token creation

core: add options to delegate BPFFS token creation

Add four new options BPFDelegate{Commands,Maps,Programs,Attachments}=
in order to delegate to a BPFFS instance the permission to create tokens.

The value is a list of options taken from:
https://github.com/torvalds/linux/blob/v6.14/include/uapi/linux/bpf.h#L922-L1121
The special value "any" means to allow every possible values.

More informations about BPF tokens here:
https://lwn.net/Articles/947173/