[WIP] add Quantum Kernel and Quantum Kernel Training benchmarks

[Gruntrexpewrus]

Summary

Implementation of the benchmarks methods for QuantumKernel and QuantumKernelTrainer.

Details and comments

These codes are developed in the project of QAMP22 (mentor @a-matsuo, mentee Leonardo Placidi). ----We are still figuring out the AVS implementation/running of the benchmark.----

[Gruntrexpewrus]

@adekusar-drl or @dlasecki could you give me "workflow approval", so I can check what problems my code gives? Sorry for the disturb!

[adekusar-drl]

Done. You can run the checks locally. Things like black, pylint, etc easier to run on your machine.

[manoelmarques]

This PR adds a benchmarks folder at root with some benchmark sample. This shouldn't be in this repo as it is supposed to run the applications benchmarks under their folders and not a global benchmark. This folder with its contents should be removed.

[CLAassistant]

All committers have signed the CLA.