Provide virtual servo in simulator for block servo set pulsepin

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Unlike for the block servo write pin, that shows a virtual servo in the simulator, there is no representation of a servo for the "servo set pulsepin (us) block.

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Could a representation of a servo be added to the "servo set pulsepin (us) block, please.

Perhaps some lower (500us) and upper (2500us) bounds would also need applying.

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An alternative would be to provide a new block to show the "set" pulse value e.g. keep keep exisitng block unchanged and have new block say "servo write pulsepin".

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Showing a servo in the simualtor for this bloack would be useful for defining a custom range for various servos and also be more relavent to speed determination when using continuous servos.

Providing such a feature would make the the block much more useful to explore realtionship between native pulse width to angle.

The issue names the servo set pulsepin (us) block and its simulator representation, but provides no files or tests. Start by locating that block's simulator implementation and comparing it with the servo write pin block. Done means the simulator shows a servo for this block and supports the requested pulse-width range behavior, including the proposed 500–2500us bounds if appropriate.