Consider TFRecord support

[CESARDELATORRE]

".tfrecord" file format is very common when using TF and files, for more efficient data processing.

Consider support for TFRecord in TensorFlow.NET, comparable to this library:

https://github.com/kevinskii/TFRecord.NET

[Oceania2018]

Helpful link to implement TFRecord. Will try.

[bitstormFA]

Any progress on this topic?