Add test environment for debugging with static snapshots enabled

[akosthekiss]

Recording a scenario from #2606

[A] failure was found when debugging IoT.js with static snapshots turned on, if an error was thrown an assertion failure was caused. The reason is the frame context's bytecode_header_p pointer was not a heap pointer. The jerry_debugger_breakpoint_hit function tries to set a compressed pointer which points to bytecode_header_p with the JMEM_CP_SET_NON_NULL_POINTER macro, which has an assertion that requires the above mentioned bytecode_header_p to be a heap pointer, which is obviously not.

[Creating a a JerryScript-only test environment is n]ot a trivial task. You need a unit test which creates such an environment, and you also need the python debugger to do debugging. Hence it needs a new infrastructure basically, where instead of a .js, a binary is run by the debugger tester driver.