MediaPipe v0.6.5 - MediaPipe Coral setup and examples

• MediaPipe on Coral dev board EdgeTPU
  • Dockerfile for cross compiling
  • Example including quantized models & graphs for Object detection & Face detection
• Bug fixes
  • iOS Tulsi setup bug
  • TFLite OpenGL ES delegate fix integration that fixes issue 219, issue 232, issue 104, issue 87, and issue 41
• Documentation
  • Setup MediaPipe on Coral dev board Edge TPU
  • Coral Object detection example
  • Coral Face detection example