Add config option for Puppet's strict setting

[ekohl]

Use Case

Puppet has a strict setting, and PDK sets it directly on Puppet instead of configuring rspec-puppet (https://github.com/voxpupuli/pdk-templates/blob/bb554cbb831d8c651cd54056ac09950228603e5e/moduleroot/spec/spec_helper.rb.erb#L52-L56). It would be best if rspec-puppet had an option to set the setting instead.

Describe the Solution You Would Like

An option like there are many others, such as strict_variables

Describe Alternatives You've Considered

None.

Additional Context

https://www.puppet.com/docs/puppet/7/configuration.html#strict

[gerases]

I'm being affected by this as well. The puppet config on disk doesn't seem to have an affect on rspec-puppet.