aya_log: Allow aya log to be consumed from C

[dave-tucker]

It would be pretty excellent to have an extern C API in aya_log, and to also package it as a staticlib.
One would then hope that we could call info(), warn() etc... from a C eBPF program.

[ajwerner]

Does the C bpf ecosystem support linking multiple compilation units together?

[dave-tucker]

As I recall it does. libbpf/bpftool has limited support. There is a fork of lld around with bpf support from Meta.
And of course, bpf-linker supports linking C too 😉