Add support to run script on a Jenkins agent

[LinuxSuRen]

Is your feature request related to a problem? Please describe.
None.

Describe the solution you'd like
An example usage: jcli agent run simple -f test.sh

Describe alternatives you've considered
None.

Additional context
See also jenkinsci/pipeline-restful-api-plugin#16

[LinuxSuRen]

/good-first-issue

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