Allow sail interactive toplevel to connect to a running QEMU instance using GDB/MI

After starting QEMU with -s -S we can run :gdb_qemu in isail to
connect to it using a gdb-multiarch child process, which we
communicate with via the gdb/mi interface.

:gdb_send command sends a command to gdb and waits for it to
respond. The idea is we will have a :gdb_sync command that will sync
the register state of the running QEMU session with the Sail
interpreter after a breakpoint, then we can run Sail code to test the
state of the machine by hooking memory reads into approprate gdb
commands.

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