bpf: Add source and instruction diagnostic context

Teach verifier diagnostics to annotate an instruction with BTF source
line information and nearby BPF instructions. The renderer keeps source
text in a fixed-width lane and prints instructions in a stable right-hand
gutter.

Wrap annotation text under the source line so long error labels remain
readable while the source and instruction lanes keep their fixed layout.

Keeping source and instruction context in one commit preserves the visual
layout contract that later diagnostic reports rely on.

Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
Link: https://patch.msgid.link/20260815064612.378577-3-memxor@gmail.com
Signed-off-by: Eduard Zingerman <eddyz87@gmail.com>

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