Move validateParams() out of the Servo control loop

[AndyZe]

As mentioned here: #2396 (comment)

validateParams() is expensive. It doesn't belong in a control loop. Some options are:

• Move the parameter loading out of the Servo class completely
• Only validate parameters that have changed at runtime. Not sure if this is possible
• Not validate parameters at all after initialization. Assume the user knows what they're doing

[ibrahiminfinite]

Not validate parameters at all after initialization. Assume the user knows what they're doing

I prefer this way if it is acceptable, can avoid some complexity as well.

[github-actions]

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