MeasurementLink Support for Python v1.2.0-dev2

What's Changed

• Support for Python services returning DoubleXYData
  • Add encoder and decoder for DoubleXYData by @dixonjoel in #358
  • Game of Life example by @dixonjoel in #360
• Examples
  • Configure mypy for all examples to disallow untyped function definitions by @bkeryan in #372
  • Use a threading.Event for cancellation instead of a local callback function and nonlocal variable.
  • Consistently use the name measurement_service for the measurement service variable.
• Misc improvements and refactoring
  • Log exceptions in more cases by @bkeryan in #371
  • Only service interfaces listed in .serviceconfig file by @dixonjoel in #368
  • Split GrpcChannelPool into a separate submodule by @bkeryan in #376
  • Add type hints and clean up documentation for encoders and decoders by @dixonjoel in #367
  • Disallow untyped defs by @bkeryan in #379
  • Revise docstrings for info.py by @bkeryan in #378

Full Changelog: 1.2.0-dev1...1.2.0-dev2