ENH -jit-compile datafits and penalties inside solver

[Badr-MOUFAD]

Context of the PR

Follow up of #137, Make jit-compilation of datafits and penalties, and thereby datafit initialization, implicit within solvers.

Contributions of the PR

• Initialize datafit inside solve method
• jit-compile datafit and penalty inside solve method

Checks before merging PR

• [ ] added documentation for any new feature
• [ ] added unittests
• [ ] edited the what's new(if applicable)