Try to reduce roundoff error in LocalGeometry constructor

[dennisYatunin]

Purpose

This PR overwrites the constructor for ClimaCore.Geometry.LocalGeometry in an attempt to reduce the amount of roundoff error, which may be responsible for the lack of conservation @szy21 has observed in long Float32 simulations.

To-do

If this change fixes the conservation issue, it should be moved into ClimaCore.

Content

• Replace gᵢⱼ = ∂x∂ξ' * ∂x∂ξ with gᵢⱼ = (∂x∂ξ' * ∂x∂ξ + (∂x∂ξ' * ∂x∂ξ)') / 2
• Replace gⁱʲ = ∂ξ∂x' * ∂ξ∂x with gⁱʲ = inv(gᵢⱼ)
• Compute J and WJ as J = det(∂x∂ξ) and WJ = W * J

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