Feature/experiment

[Atahanak]

Initial PR for the Experiment namespace. The experiment infrastructure is implemented along with some additional example functions for the user and two lib examples.

Experiment tutorial and advanced testing left to another PR.

[AmroAlJundi]

Looks great. But I have some comments, requests, and discussions :)

• Add some tests if possible.

• Make LoadDataFunction an std::function rather than a function pointer. This allows for us to pass formats to the loader from main as shown here (I compiled this and it worked):
  
  Note: this would require the _dataLoaders member to become vector<LoadDataFunction>.

• Make LoadDataFunction take a map of strings->strings, vector of strings, or a map string->any.

  • Maybe additional strings can be part of the std::any parameter in the pair?

• I like how the file parameters are passed to the kernel. I think we should generalize this further:

  1. Just like how files have an associated std::any parameter, I think preprocessing should have one. Kernel functions would take both the file params and the preprocess params.
  2. Pass the file params object to the preprocessing function.

  In other words, a file will have its params, a preprocess its params, and a kernel its params. A loader functions will know about the params of its input, a preprocess function will know about its params and the params of the file it's reading, and a kernel function will know about its params, the preprocess params used for this iteration, and the params of the input it's using.

  Just to clarify, I mean that the same file params that you pass to the kernel function you pass to the preprocess and loaded function, and the same preprocess param you pass to the kernel you pass to the preprocessing, i.e. a single param object per function.

• The names of data members should have the underscore at the end of the name not the beginning.

• I think we should have a function that generates IDs. This way, the user can generate the ID himself in case he wanted to query something. This is not that important though.

[AmroAlJundi]

Miniscule changes were requested, but they're not that important.

[AmroAlJundi]

Maybe you can be more specific here that this identifier is for the runtimes, results, and aux data of experiments that use this specific preprocessing. It sort of feels vague to me here 😅