add reactor.py to sources

[tmm1]

I saw a failure trying to build and use tools:

$ ./build/frida-macos-arm64/bin/frida-ls-devices
Traceback (most recent call last):
  File "/Users/tmm1/fancybits/frida/./build/frida-macos-arm64/bin/frida-ls-devices", line 10, in <module>
    frida_tools.lsd.main()
  File "/Users/tmm1/fancybits/frida/build/frida-macos-arm64/lib/python3.10/site-packages/frida_tools/lsd.py", line 6, in main
    from frida_tools.application import ConsoleApplication
  File "/Users/tmm1/fancybits/frida/build/frida-macos-arm64/lib/python3.10/site-packages/frida_tools/application.py", line 25, in <module>
    from frida_tools.reactor import Reactor
ModuleNotFoundError: No module named 'frida_tools.reactor'

[oleavr]

Thanks! 🙌