[proposal] create a standardized equality API for components that do comparisons

[samrichardsontylertech]

Add an equals property to components that do comparisons. This property would consist of a predicate to compare two values and determine equality.

Several components currently have different implementations of the concept, for example the autocomplete's matchKey property, but these are inconsistent in naming, behavior, and which components make use of them. This results in an API that can be unpredictable or fall short of the needs of consumers. Adopting a standardized method with consistent naming and behavior across the component library should address these issues.

Affected components

• Autocomplete
• List
• Menu
• Select
• Table

Benefits

The consistent API will make it easier to keep track of and customize component behavior.

Caveats

Some components may need to perform different comparisons in different situations. Having one property dedicated to determining equality could conflict with that.