[TMVA][SOFIE] Benchmark of models with ONNXRuntime

[fsossai]

Benchmarks of models with ONNX Runtime and SOFIE

SOFIE is designed for fast inference, that's why having a reference benchmark with the state-of-the-art ONNX processing framework (ONNX Runtime) comes in handy for asserting the performance of the models emitted by SOFIE.

Integrating ONNX Runtime

The official repository still doesn't provide a CMake script for automatically finding ORT in the system, that's why I wrote a basic package finder.

• CMake package finder (a.k.a. FindONNXRuntime.cmake).
• GBenchmark for ONNX models with ONNXRuntime libraries.
• Manual GBenchmark for models emitted by SOFIE, Linear models only.
• Automating the compilation of models with SOFIE.

Notes

• For every ONNX model in input_models a gbenchmark is automatically created.

• For every .hxx file in input_models/compiled a gbenchmark for SOFIE is automatically created.
  All of this happens by means of BENCHMARK_CAPTUREs configured a CMake script.

[lmoneta]

This PR is replaced by #239. The initial commits are moved to the new PR.