micro: port op SPACE_TO_DEPTH from lite

[rkuester]

@tensorflow/micro

This issue tracks my work porting operator SPACE_TO_DEPTH from lite to micro. The port will be submitted in a number of PRs. Here's a rough flight plan in the style of #45306:

• PR 1: Extract the code for parsing the op from a flatbuffer out of ParseOpDataTfLite in tensorflow/lite/core/api/flatbuffer_conversions.cc into a standalone function that can be called from micro's op resolver
• PR 2: Extract the reference implementation out of tensorflow/lite/kernels/internal/reference/reference_ops.h into its own header which can be included without dragging in reference_ops.h's dependences
• PR 3: Copy operator from lite to micro without making any changes or including in the build
• PR 4: Delete extra code from the micro copy of the operator
• PR 5: Port micro copy of operator as necessary and add a corresponding test

[rkuester]

This issue has been migrated to the tflite-micro repository as tensorflow/tflite-micro#113.

[google-ml-butler]

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