feat: add need_reload flags to model constructors

[lplonka-splunk]

This PR adds possibility to set need_reload flags in model constructors.

[sgoral-splunk]

I know it's just a flag settings but I wonder if we can add some basic integration test to verify amount of reloads here

[srv-rr-github-token]

:tada: This PR is included in version 6.5.0 :tada:

The release is available on GitHub release

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