Add msg to show the computed temperature range computed from temperature gradient

[iche033]

Signed-off-by: Ian Chen [email protected]

Summary

Currently users set the temperature gradient through sdf but there is no way to know what the actual temperature range that is computed from this gradient value. This PR adds a print statement to output the computed temperature range value

Test it

ign gazebo -v 4 src/ign-gazebo/examples/worlds/thermal_camera.sdf

and you should see the msg:

[Msg] Setting ambient temperature to 300 Kelvin and gradient to 0.1 K/m. The resulting temperature range is: 11.5444 Kelvin.

Checklist

• Signed all commits for DCO
• Added tests
• Updated documentation (as needed)
• Updated migration guide (as needed)
• codecheck passed (See contributing)
• All tests passed (See test coverage)
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