Feat: added config for faster r-cnn with efficientnet

[TNodeCode]

Motivation

Created a new configuration for Faster R-CNN that uses EfficientNet as a feature extractor. In my experiments that leads to better results than when using ResNet.

Modification

Added a new configuration file

BC-breaking (Optional)

No

Use cases (Optional)

Object Detection

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[lauriebax]

It seems you have committed an empty file. Can you take a look at that?