Allow flux injection in the out-of-plane direction for RZ/2D geometry (#2788)

* Implement injection orthogal to plane

* Generalize momentum distribution for flux injection

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* Revert "[pre-commit.ci] auto fixes from pre-commit.com hooks"

This reverts commit b0cd1891771a4c49c14abb7cb9df7374cee4458c.

* Revert "Generalize momentum distribution for flux injection"

This reverts commit 0a22b1d8fa68a3a5705d8f4824f757b6dee497f0.

* Rotate momentum initialization

* Correct flux number when the direction is normal to plane

* Update distribution of particles within a cell

* Clean-up injection code

* Add more documentation

* Add more comments

* Handle 1D case

* Only do the rotation for Gaussian flux profile

* Fix compilation error

* Correct compilation for GPU

* Start adding automated test

* Correct sign of velocity

* Update to add continuous injection

* Finalize test

* Correct processing of flux_normal_axis

* Add checksum

* [pre-commit.ci] auto fixes from pre-commit.com hooks

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* Fix bug

* Update script

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* Update checksum

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

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