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santad: Add signal auth to tamper resistence. (#1360)

Prior to this change, root users could kill the com.google.santa.daemon process. 
It would be immediately restarted by sysextd but this opens a very brief
window where protection is lost. Hooking AUTH_SIGNAL and blocking all
signals to the santad process except those sent by launchd lets us block
this without breaking upgrades, reboots, etc.

This leaves `launchctl kill` and friends as an avenue, so we're also
hooking for exec and blocking executions of launchctl that reference
com.google.santa.daemon except in known safe cases.

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