feat(space): add spherical cylinder surface

[Robby955]

Summary

Adds the spherical cylinder surface API under PhyslibAlpha.SpaceAndTime.Space.Surfaces.

Changes

• Defines the spherical cylinder embedding into Space 3 as the unit circular shell in Space 2 transported through slice 2, extruded along ℝ.
• Adds injectivity, continuity, and measurable embedding lemmas.
• Adds the induced surface measure, tempered-growth instance, and SFinite instance.
• Adds the corresponding distribution and integral application lemmas.

Notes

• This intentionally does not add IsFiniteMeasure: the cylinder is unbounded along the axis.
• No measure-zero theorem: issue API: Spatial Surfaces #943 asks for that only where applicable, and the sibling surface files do not expose analogous null-range theorems.

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[jstoobysmith]

Looks good.