Release 26.03

[ax3l]

The March release of ImpactX :)

PRs to wait for

• Example using RF cavity with Hook feature for phasing #1353
• maybe PALS Python 0.3.0, Unit Convention for Quad #1357
• maybe Throw Exceptions in Asserts #1350
• maybe Add spin to ExactQuad. #1323

[codspeed-hq]

Merging this PR will not alter performance

✅ 37 untouched benchmarks

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_{Comparing ax3l:release-26.03 (2eadeff) with development (600f3ca)}