info: expose additional `bpf_prog_info` fields in `ProgramInfo`

[tyrone-wu]

Hello! 👋

I'm implementing a Telegraf plugin that extracts metadata information from the bpf_prog_info object. There's some additional fields that I'd like to include in the metric, that aren't exposed in ProgramInfo.

The additional fields that are exposes are:

• jited_prog_len
• xlated_prog_len
• load_time
• verified_insns