Olga Shapoval

Follow-up PR: Add cupy callbacks picmi

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This follow-up PR (initial https://github.com/BLAST-WarpX/warpx/pull/6354) makes electrons a global variable and removes previously added conditional deletion of electrons to prevent pre-commit check failures.

This PR implements particle splitting as part of the resampling algorithm. A detailed description will be added. To do: - [ ] add CI test - [ ] ....

To do: - [x] - add LWFA inputs parameter list using PSATD RZ simulation in a boosted frame - added a new CI test and linked its input to the...

P/S/ Do not merge, for comparison only.