Add timers.lua API module and test_timers.lua test program.

Since timers presents a timers.Timer Lua class supporting queries and
cancellation, make TimersListener::scheduleAfter() and scheduleEvery() respond
immediately so the newly constructed Timer object has the reqid necessary to
perform those subsequent operations.

This requires that Lua invocations of these operations avoid calling the
caller's callback with that initial response.

Reinvent leap.generate() to return a Lua object supporting next() and done()
methods. A plain Lua coroutine that (indirectly) calls fiber.wait() confuses
the fiber scheduler, so avoid implementing generate() as a Lua coroutine.

Add a bit more leap.lua diagnostic output.

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