[next] align with dom-expressions

[titoBouzout]

Summary

• add missing imports/exports for MathMLElements and friends for solid-h and solid-html
• consolidate namespaces into Namespaces
• remove from spread in dynamic deprecated attribute isSvg
• add support for mathml in dynamic
• remove unused Properties

How did you test this change?

I havent, but Im confident.

Note: This PR needs merging of first ryansolid/dom-expressions#498

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Latest commit: 0b19aa6

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