Address missing tandems

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Similar to phetsims/my-solar-system#281, I figured we should do this for keplers-laws while this painful process is still fresh in my mind.

Running with:
http://localhost:8080/studio/?sim=keplers-laws&phetioPrintMissingTandems&locales=*&keyboardLocaleSwitcher&phetioWrapperDebug=true&phetioElementsDisplay=all&phetioValidation=true

... there are currently 200 missing required tandems, 3177 missing optional tandems.

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After the above commits, we now have 0 missing required tandems.

There were 10 missing tandems responsible for the 200 missing tandems messages in the original console output. That's a lot of noise.

Onward to removing phet-io.validation: false from package.json.

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I'll leave this open to verify that there are no CT problems.

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CT is happy. Closing.