Masks off assertions, printfs, and autocounter events when the target bool is deasserted.

Users typically wish to disable many forms instrumentation (e.g., synthesized assertions and printfs, autocounters) while the target is under reset. By default, most of FireSim's instrumentations features mask off events using a module-local reset, generally Chisel's implicit reset. However, in some cases the module-local reset may not be asserted at the start of a reset sequence, leading to spurious assertion fires. This annotation provides a coarse-grained means to globally mask off these events until the target is sufficiently far in reset.

Note, while it is possible to use this signal as a replacement for FireSim's trigger system, it is intended to support this time-zero reset case, and has different timing semantics. See: https://docs.fires.im/en/latest/Golden-Gate/Triggers.html