Update the ESLint valid-styles rule to use a strict CSS value parser.

[nmn]

The ESlint valid-styles rules was initially created by refactoring static types. As such, in many cases it allows arbitrary strings when only a particular CSS type should be allowed.

We have some occasional use regular expressions, but, overall, the the rule is far too permissive and easily allows invalid CSS values.

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The Task

The ESLint rule should be updated to use a proper CSS value parser to properly validate the values used with StyleX. For example, a width must be a valid length, CSS variable or calc expression and not just any arbitrary string.

The nmn/css-value-parser can be used as the parser for this use-case. (See also, #721 and #722)