ac table-drive BPF extra-code generation away from switches

Replace the large switch in generateExtra with an extraEmitters
registry (map[TracepointKind]extraEmitter) and convert six inner
switch-on-name helpers to table-driven lookups:

- generateExtraMem    -> memFieldOverrides table
- generateExtraEventfd -> eventfdFlagsExpr table
- generateExtraTwoFd  -> twoFdOverrides + twoFdDefault
- generateExtraPoll   -> pollOverrides + pollTimeoutBody(style)
- generateExtraSleep  -> sleepTimespecPtr table
- generateExtraKeyctl -> keyctlOverrides table

Adding a new syscall kind or variant now requires only a table
entry instead of editing switch arms with raw C string literals.
Generated BPF C output is behaviorally equivalent; all existing
tests pass unchanged.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

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