pkg/detect: add a new package to detect kernel config

[mtardy]

As we detect BPF features using pkg/bpf/detect.go for now, it would be interesting to add more detection logic for other kernel configs that Tetragon makes use of. Indeed we have some users who cannot start Tetragon or see warnings without understanding how it's related to their kernel configuration.

This originates from this Slack conversation where user seemed to miss:

• CONFIG_AUDIT to get /proc/*/loginuid.
• CONFIG_SECURITY to have security_bprm_committing_creds available.