run_command: support array of commands

[bastelfreak]

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Use Case

Due to security concerns, the best practice for commands in Puppet DSL are now arrays: https://www.puppet.com/docs/puppet/7/types/exec.html#exec-attribute-command

The run_command() only supports the String datatype as input and I think it makes sense that it supports array as well.

Describe the Solution You Would Like

Array support for the commands in run_command()

Describe Alternatives You've Considered

A clear and concise description of any alternative solutions or features you've considered.

Additional Context

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