Add IVIMFitSlicer Extension

[Atakanisik]

This PR adds a new extension IVIMFitSlicer for Intravoxel Incoherent Motion (IVIM) Diffusion MRI analysis.

Key Features:

• Multi-Model Fitting: Supports Mono-exponential (ADC), Bi-exponential (IVIM), and Tri-exponential models.
• Hybrid Analysis: Performs simultaneous voxel-wise parametric mapping and ROI-based statistical analysis.
• Interactive Graphs: Observing fitting graphs for mean ROI

Sources are hosted at: https://github.com/Atakanisik/SlicerIVIMFit

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[lassoan]

Thank you for your contribution! This looks like a very useful extension and there are only a few things to address:

• Do not install any Python packages in the file scope (when the .py file is parsed), it would slow down the Slicer application startup, even if the user does not open your module. Install dependencies when the use enters your module, but even better if you install when the processing is started.
• Do not import anything at file scope (you cannot import them, as they will not be installed yet), but only in the methods where they are actually needed.
• There is no information provided on where to obtain sample data for testing or demonstration purposes. If you want users to actually try your module and have good experience with it, the best is if you provide data that is known to work well with it. I would recommend to upload images to your github repository as release assets. It would be even nicer if you registered those data sets into the Sample Data module (so that the user can download them by a few clicks) - see example here.
• pydicom is bundled with Slicer, no need to install it

[Atakanisik]

@lassoan Thank you for review and comments.First of all i am a big fan of you and your team so these comments is important to me. i've made the changes you advised. Now what is the next step? Should i change my .json file to re-run job? what is your reccomendations??