Show description or tooltip on boolean controls

[brockfanning]

The intended behavior here is that if a boolean control has a description, then it will appear as a tooltip. However if showUnfocusedDescription is true, then the description appears below as text. I tried to copy as much code from existing components as possible, but I'm happy to make any changes as needed.

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[CLAassistant]

All committers have signed the CLA.

[coveralls]

Coverage: 83.193%. Remained the same when pulling d292be4 on brockfanning:mui-checkbox-with-description into 3b32c9b on eclipsesource:master.

[lucas-koehler]

Hello @brockfanning, thank you very much for your contribution :)
I tested it and it seems to work well.

I have two requests:

1. Could you extend one the examples to contain a description for the boolean control. E.g. you could extend packages/examples/src/examples/control-options.ts
2. Could you also add this behavior to the MaterialBooleanToggleControl as well? This way both boolean controls behave consistently.

[lucas-koehler]

LGTM. Thanks for the updates and again for the contribution :)
CI did not run again due to a first time contributor. However, I executed the build and unit tests locally and they still worked :)