Add LLLUAmanager::startScriptFile(), startScriptLine() functions.

Break out for LLLUAmanager consumers the promise/future semantics of
waitScriptFile() and waitScriptLine(). startScriptMumble() uses
runScriptMumble() to launch a coroutine to run the specified Lua script or
chunk, providing an internal adapter callback to set a promise on completion.
It then returns to its caller the future obtained from that promise. This
allows a caller to call startScriptMumble(), run in parallel with the Lua
coroutine for a while and then call get() on the returned future to wait for
results.

waitScriptMumble() is then trivially implemented using startScriptMumble().

Fix runScriptLine()'s logic to abbreviate the passed Lua chunk for use as the
description. We were erroneously assigning back through a string_view of the
parameter, which overwrote a temporary string in the argument list.

With Lua 5.4, listen_events() tried to discover the main "thread" (Lua
coroutine) associated with the current lua_State so we could call async
callbacks on that thread. Luau doesn't seem to provide that feature, so run
callbacks on whichever thread calls listen_events().

Reinstate original multi-argument lua_print_msg(), tweaked to avoid the Lua
5.4 lua_rotate() function, which is missing from Luau.

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