First prototype for data-vector blinding using firecrown likelihoods

[arthurmloureiro]

[NAME STILL PENDING, PLEASE IGNORE THE INSTANCES OF smokescreen]

This first prototype for the blinding data-vector using firecrown likelihoods is ready.

Note that there are still a lot to be implemented, however, these first draft should be pushed to main if approved.

For a working example, check the notebook on /notebooks/test_blinding_prototype.ipynb.

Documentation is pending as the infrastructure is expected to change quickly in the next few weeks.

[arthurmloureiro]

Tagging @tilmantroester (unsure how I can add you as a reviewer!)

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[arthurmloureiro]

Unit test coverage is passed the 90% : https://app.codecov.io/gh/LSSTDESC/Blinding/tree/develop/src%2Fblinding