ComponentTransform should impl Default

[adamchalmers]

Default to no change, i.e. identity transform.

This way instead of writing

ComponentTransform {
    translate: myTranslate,
    rotate_rpy: None,
    rotate_angle_axis: None,
    scale: None,
}

you can just do

ComponentTransform {
    translate: myTranslate,
    ..Default::default()
}

[codecov]

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All modified and coverable lines are covered by tests ✅

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@@           Coverage Diff           @@
##             main     #857   +/-   ##
=======================================
  Coverage        ?   24.86%           
=======================================
  Files           ?       36           
  Lines           ?     2192           
  Branches        ?        0           
=======================================
  Hits            ?      545           
  Misses          ?     1647           
  Partials        ?        0           

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unittests	24.86% <ø> (?)

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