Improve the codegen of the vector accelerated `System.Numerics.*` types (#81335)

Improve the codegen of the vector accelerated `System.Numerics.*` types (#81335)

* Allow Quaternion and Plane to be imported as TYP_SIMD16

* Add some minimal intrinsification of Quaternion and Plane

* Ensure Vector indexers are marked readonly

* Ensure the vector constant properties are intrinsic

* Ensure that the vector GetElement and WithElement APIs are intrinsic

* Ensure vector division by scalar is intrinsic

* Minor cleanup to vector files

* Ensure vector arithmetic functions are consistently intrinsic

* Ensure creating a plane from a vector4 is intrinsic

* Ensure accessing the Normal field of a Plane is efficient

* Ensure Quaternion and Plane return the correct SimdAsHWIntrinsicClassId

* Specially optimize Create(Dot(..., ...)) and Create(Sqrt(Dot(..., ...)))

* Ensure vector clamp is intrinsic

* Ensure vector lerp is intrinsic

* Ensure vector length is intrinsic

* Ensure vector normalize is intrinsic

* Ensure vector distance is intrinsic

* Optimize the vector transform by matrix methods

* Ensure quaternion conjugate and inverse are intrinsic

* Fixing assert, formatting, and build failure

* Ensure Quaternion.Inverse uses LengthSquared not Length

* Ensure Create APIs are correctly imported as intrinsic

* Ensure we don't assert for AltJit

* Ensure lowering DotProd doesn't break CSE for scalar vs vector results

* Minimally fixup Mono for the new intrinsics

* Ensure SN_GetElement doesn't raise an assert

* Ensure get_UnitW is ordered correctly for Mono

* Try to fix SN_GetElement

* Fix SN_WithElement for Mono

* Resolving mono formatting feedback