docs(cdk/testing): document TestElement methods

[yjaaidi]

Add missing documentation for freshly added methods: setInputValue, selectOptions & dispatchEvent.

[crisbeto]

The changes are fine, but I'm wondering whether we should be listing the methods out like this since the file is bound to go out of sync again. WDYT @mmalerba?

[yjaaidi]

Thanks @crisbeto. You are right!
What about a link to something like https://material.angular.io/api/cdk/testing/TestElement. How is https://angular.io/api generated?

[crisbeto]

The rest of the docs are generated from the source, but I'm not sure why TestElement isn't showing up.

[mmalerba]

We do have a page that lists the API: https://material.angular.io/cdk/test-harnesses/api#TestElement maybe we can link to that instead

[yjaaidi]

Good idea @mmalerba . Maybe we should also link to HarnessEnvironemnt API etc... and remove all the API tables.

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