Add speedrate argument for insert/eject functions in wiregrid_actuator agent

[sadachi5]

Description

Add speedrate argument for insert/eject functions in wiregrid_actuator agent and set the limitation of the parameter from 0.0 to 5.0.

Motivation and Context

The default value of speedrate is 1.0 and changing speedrate allows us to do fast inserting or ejecting, which is useful to check the difference between the detector responses with and without the wiregrid. Setting the speedrate to 5.0, the time duration for each inserting or ejecting would be about 30 sec which is three times shorter than that in default setting (speedrate=1.0).

CAUTION!!
speedrate > 1.0 must not be selected if elevation is not 90 deg.

How Has This Been Tested?

It was tested in Kyoto using wiregrid.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.