Add hook for socket redirection.

Some documentation at section 1.3 of https://blogs.oracle.com/linux/post/bpf-a-tour-of-program-types.

Program types:
- [ ] `BPF_PROG_TYPE_SK_SKB`
- [ ] `BPF_PROG_TYPE_SK_MSG`

Attach types:
- [ ] `BPF_SK_SKB_STREAM_PARSER`
- [ ] `BPF_SK_SKB_STREAM_VERDICT`
- [ ] `BPF_SK_MSG_VERDICT`

These are used for socket redirection. Related to #678 and #784.

Start by reading section 1.3 of the linked Oracle article to understand the listed socket-redirection program and attach types. Review related issues #678 and #784 for existing context, then locate the project's current hook support. Done means the requested socket-redirection hooks are supported and covered by the relevant project tests.

Written by the indexing model from the issue text.