types: Move per-element type interfaces into core and more strictly t…

…ype IntrinsicElements (#4546)

* style: Rearrange MathML types

* refactor: Move per-element attribute types into core

* refactor: Create new global attributes type

* refactor: Remove deprecated & non-standard webview types

* refactor: Narrow element types

* style: Formatting

* refactor: Rename & re-export AllHTMLAttributes interface

* refactor: Rename inconsistent MathML interfaces

* refactor: Narrow MathML element types

* fix: popoverTarget & popoverTargetAction types