[WIP] adding ShaderEval tasks

[Vipitis]

Hey, first PR for me here:

adding ShaderEval task1, this is essentially just implementing the task as is in the EvaluationSuite: return completion.
the task is very much just meant as a "proof of concept" as there are several issues with it. I do plan on introducing more tasks to this benchmark soon and also make them generally better.
I do have several question too.

some differences that should not impact the results:

• generation returns the prompt, so we remove it again in postprocess_generation
• stop word is set as ";" - not the list of all tokens containing the semicolon (does the EndOfFunctionCriteria handle this?)
• generation parameters can't be set so user has to set --do_sample False to use greedy search (temperature can't be set to 0?)

concerns I hope to address:

• my term paper on the project isn't yet published so I got no reference to explain the tasks
• my naming convention doesn't seem to fit
• I did not add any documentation yet
• fix the dataset revision to 0.0.2 for this task specifically
• I had to comment out all import fcntl as that module does not exist on my home machine (Windows), so running tests wasn't possible
• It's really slow on my home machine (as Intel GPU is not supported in accelerate on Windows), therefore I have only been able to run a few models with really short snippets. I got matching scores for gpt2, bigscience/bloom-560m and Vipitis/santacoder-finetuned-Shadertoys-fine when running just 10 samples. Additionally I did a single run with 300 samples (this snippet is used throughout the paper) and got matching numbers of 0.566
  Run parameters were the following:

accelerate launch main.py \
  --model Vipitis/santacoder-finetuned-Shadertoys-fine \
  --tasks ShaderEval \
  --limit 10 \
  --do_sample False \ 
  --save_generations \
  --save_generations_path generations_py.json \
  --use_auth_token \
  --trust_remote_code

(not having the last two doesn't throw any error but still runs (even slower) and return erroneous outputs)

[Vipitis]

converted to draft as development of the next tasks has started on this branch. Will try to add the other tasks when they are ready. I don't plan to change task1 but might improve the implementation.

[Vipitis]

closed due to cleaning up a bunch of stuff.
I will open a new draft PR in a few weeks that will hopefully provide a better implementation as well as documentation.
Plan currently is to have the data and implementation finished by the end of this year.