[w3c/clipboard-apis] Should we have an API to return the set of readable/writable data types? (#67)

We should consider defining a way for JS to determine the set of data types that the UA supports for reading/writing.

Currently, we have a list of supported types in [10. Mandatory data types](https://w3c.github.io/clipboard-apis/#mandatory-data-types-x). But some UAs may choose to support a larger set.

In addition, note that the set of supported types will be different for the legacy (execCommand-based) APIs and the new Async APIs, because the newer APIs can safely support a larger set of types.


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